WO2001005095A1

WO2001005095A1 - Packet transfer method and relay transfer device, sender transfer device and receiver transfer device, and packet communication system

Info

Publication number: WO2001005095A1
Application number: PCT/JP1999/003720
Authority: WO
Inventors: Mitsuru Tanida; Kouji Yano
Original assignee: Fujitsu Limited
Priority date: 1999-07-09
Filing date: 1999-07-09
Publication date: 2001-01-18

Abstract

A packet communication system (60) using the VOIP scheme comprising a sender transfer device (3a) provided with receiving means (100a), destination changing means (12), and transmitting means (101a), a receiver transfer device (3c) provided with receiving means (100c), destination changing means (12), and transmitting means (101c), and a relay transfer device (3b) provided with synchronization detecting means (102), receiving means (100b), loopback connection judging means (10), and destination change requesting means (11a, 11b), whereby the sound quality and delay time are equivalent to those when there is no relay exchange, it is unnecessary to set transfer information in the transfer devices, and hence it is possible to operate the packet communication system while the number of packets accommodated in the TDM circuit which can be used for each channel is ensured.

Description

Description Bucket method and

Relay transfer device, originating transfer device and destination transfer device, and

Bucket communication system

The present invention relates to a bucket transfer method, a relay transfer device, an originating transfer device, a destination transfer device, and a packet communication system suitable for use in, for example, a VOIP technology for making a voice call in a LAN or a WAN. Background art

In recent years, some companies have begun adopting voice communication systems that use the Internet instead of the existing public telephone network to reduce telecommunications costs, instead of using the existing public telephone network. . This voice communication system is a system for transmitting voice signals using an IP (internet protocol) packet, and is capable of real-time voice communication over a LAN (Local Area Network) or WAN (Wide Area Network). It is. In order to make this voice call, VOIP (Voice Over IP) technology is used.

The VOIP is a technology for converting an audio signal into an IP bucket and transmitting the IP bucket using a UDP (User Datagram Protocol). Also, UDP is a protocol that does not perform flow control or jllll? Control for reliability when routing data in an IΡ packet, and it passes through different routes in the network. Since the adjustment of the stream of the incoming IP bucket 1 is not performed, routing can be performed without reducing the amount of data.

This IΡ bucket is referred to as an IΡ datagram. In the following description, it is referred to as an IΡ bucket. Further, in the following description, a signal obtained by converting an audio signal into an I-packet may be particularly referred to as an audio packet. Data that is converted into an I-packet and corresponding to the audio signal is referred to as audio data. It may be called. FIG. 12 is a configuration diagram of a conventional voice communication system. The voice communication system 90 shown in FIG. 12 includes exchanges 91a, 91b, 91c, a LANZWAN 92, and gateways 93a, 93b, 93c.

Here, the LAN / WAN 92 is a line using LAN or WAN. In the following description, this notation means the same meaning.

The exchanges 91a, 91b, and 91c perform exchange processing on time-division multiplexed voice channels, and accommodate extension telephones 94a, 94b, and 94c, respectively. . For example, the exchange 91a accommodates the power of the extension telephone 94a and a plurality of extension telephones (not shown) by using a time division multiplexing system, and exchanges a TDM time division multiplexing (TDM) telephone line. Processing is in progress. The same applies to exchanges 91b and 91c. Furthermore, the exchange 91a analyzes the number dialed by the extension telephone 94a, and when recognizing a connection request to the extension telephone 94, sends a ^^ call setup message and sets up a TDM line (TDM telephone line). The signal is transmitted to the gateway 93a via the control signal path.

Further, the gateways 93a, 93b, 93c are connected to these exchanges 91a, 91b, 91c and LANZWAN 92, respectively, and compress PCM (Pulse Coded Modulation) signals input through the TDM line. And IP ,. The IP packet is passed to the IP layer, and the IP packet passed from the IP layer is converted into a PCM signal by performing decompression decoding and transmitted to the exchange 91a. It has become.

The gateway 93a sets up a control signal path (see the solid line in FIG. 12) between the exchange 91a and the existing individual signal line set on the TDM line. The voice data path is set using the existing voice channel (see the dotted line in Fig. 12) set for the line. In addition, the gateway 93a sets a control signal path using a TCP connection with the LAN / WAN 92, and sets a voice data path using a UDP connection. It's swelling. The control signal path in this TCP connection is set by transmitting and receiving signaling messages.

Then, the gateway 93a converts the PCM signal coming from the exchange 91a into a compression code. It decrypts and decomposes, and assembles IP packets received from LNZN92 to perform decompression decoding. For example, if a call is made from the extension telephone 94a, the exchange 91a sends a call setup message to the gateway 93a, and the gateway 93a sends the call setup message in the call setup message. Based on the number, the IP address of the destination gateway 93c is extracted as destination information (destination information), a TCP connection is set as a control signal path, and a call setup message is transmitted using a UDP connection. Send to gateway 93c.

The gateway 93b is a relay transfer device that routes a message sent from the gateway 93a, and is connected to the exchange 91b and the LANZWAN 92, and is connected to the gateway 93a. Similarly to the above, it has an audio data path and a control signal path. As is well known, this routing means setting a route to be used from among a plurality of routes when an IP packet is transmitted from a transmission source to a final gateway or system.

Further, the gateway 93c stores the voice bucket transmission destination information (the IP address and the UDP port number of the gateway 93c) in the call setting response message and returns the destination. Yes, it is connected to the exchange 1c and the LANZWAN 92, and has an audio data path and a control signal path, similarly to the gateway 93a. As a result, the gateway 93a writes the voice bucket sending destination information including the IP address of the gateway 93a and the UDP port number in the call setting message, and sends the call setting message. When the link strength is set, a signaling message is transmitted and received by the TCP connection between the gateway 93a and the gateway 93c to secure synchronization, and the voice packet is transmitted by the UDP connection. It is transmitted and received in both directions by a xylon. In addition, this allows a plurality of exchanges 91a, 91b, 91c to be connected to L ANZWAN 92 for communication.

As described above, since the gateway in the network is connected to the full mesh in the communication via the LAN / WAN 92, the originating transfer device (the originating gateway) is directly transmitted without passing through the relay exchange 91b. (The gateway) and the destination 着 device (the destination gateway) can be connected.

Next, based on Fig. 13, the transit switching when the operation power for routing the call is added The embodiment will be described. FIG. 13 is an explanatory diagram of the loopback connection. After the extension telephone 94a of the exchange 91a and the extension telephone 94b of the exchange 91b once enter a talk state, the extension telephone 94 This shows a state in which a call has been notified to the extension telephone 94c by the operation b. The components having the same reference numerals shown in FIG. 13 are the same as those described with reference to FIG. 12, and further description thereof will be omitted. The dotted line shown in FIG. 13 represents the audio data path, and the solid line represents the control signal path.

First, control signal paths are set between the exchanges 9 1a and 9 1b and between the exchanges 9 1b and 9 1c, synchronization is secured by signaling messages, and voice packets are It is sent and received bi-directionally via a UDP connection. Here, the PCM signal sent from the exchange 91a is compression-encoded and IP-packetized by the gateway 93a, and sent to the gateway 93b.

Here, the gateway 93 b once decompresses and decodes the received IP bucket, and sends the resulting PCM signal to the exchange 91 b using the voice data path shown in FIG. Then, the PCM signal is looped back by the exchange 91b, input again to the gateway 93b using the same route (returned connection), compression-encoded, IP-packetized, and converted to a gateway 93c. Sent out. In the gateway 93c, the IP packet is assembled again, decompressed and decoded, and the PCM signal is transmitted to the exchange 91c through the voice data path, and the voice is transmitted to the extension telephone 94c. Information is transmitted and real-time voice communication is possible.

As described above, in the conventional technology, since the path of the signaling message and the path of the voice data are “binding”, the following problems occur when the relay switching power is performed.

First, the first problem is that the delay between the audio signal and the audio data is increased because the packet is disassembled into IP packets and the audio frame is assembled from the IP packets in multiple stages. . In other words, when an IP packetized voice signal is transmitted on a network without SE (Quality of Service), it is necessary for the receiving side to absorb variations and fluctuations in transmission delay in the network. Usually, the receiving side stores and decodes the voice bucket for a certain period of time. If this storage time is shortened, the voice delay perceived by the wild boar can be reduced, but in this case, the voice bucket delayed beyond a predetermined time will not be decoded, and as a result, the voice quality will deteriorate. Becomes

Therefore, in consideration of the trade-off between the voice delay and the voice quality, it is necessary to allow a certain delay time for absorbing a certain fluctuation. Regarding this delay, the IP bucket-based method is disadvantageous in comparison with the TDM line and the ATM path, and the delay time of fluctuation absorption is simply added by multi-stage relay switching. This has an unacceptable adverse effect on call quality.

Next, the second problem is that voice quality is degraded due to multi-stage voice processing. In order to make effective use of the network bandwidth, techniques for efficiently compressing and encoding audio signals are widely used.Generally, in audio compression and encoding, distortion of the audio waveform due to quantization noise is generated. Power arises. Here, if the input voice signal has little noise, the distortion is an acceptable force. If the voice signal power with quantization noise added is input, the sound quality will be greatly degraded. Therefore, when the connection is performed in the connection mode as shown in FIG. 12, the audio signal is converted into audio data after being subjected to high-efficiency compression encoding, and the received audio data is subjected to decompression decoding and then to audio data. Since the process of obtaining a signal is repeated a plurality of times, the voice quality is greatly degraded.

Further, the third problem is that the setting of routing information and the like is required for each gateway, which complicates the operation. The fact that the gateways are connected in a full mesh has the advantage that the β network can be used as an IP network, but if relay switching power is not used, the routing information is transferred to all of the networks in the network. There is a problem that must be set to the gateway way. That is, the routing information must be set based on the IP address of the gateway corresponding to the station number of the exchange, and this routing information must be set for all gateways.

Also, in voice relay networks based on the time-division switching system, digit erasure and playback methods that reduce the number of digits transmitted and received between stations have been widely used to shorten the connection time on individual signal lines. This is another D channel like ISDN. The one that operates the Nore common line is also followed. When introducing a gateway to an IP network in such an existing network, it is still necessary to set the number erasure re-entry for the gateway in detail, which promotes the ease of operation. Failure to do so may cause an accident.

In addition, the fourth problem is that the TDM line between the gateway and the exchange cannot be allocated for each route. The fact that the gateways are connected to the full mesh means that the TDM line power between the exchange and the gateway is shared by multiple routes, which is an effective use capability. On the other hand, the number of lines cannot be guaranteed at least for the outgoing route (switching power at the outgoing side, the route to the exchange on the TDM line side network). For this reason, there is a problem that if all TDM lines are used by a call to one route, calls cannot be made to another route.

The present invention has been devised in view of such a problem, and is capable of compressing and encoding a PCM signal and decomposing the PCM signal into an IP packet, regardless of the number of steps of the relay switching power, and a set of IP packets and decompression decoding. The first objective is to obtain the same quality and time as ΔS as in the case where there is no relay exchange for voice quality and delay time. In addition, by solving such problems, it is unnecessary to set routing information to the gateway, and it is also possible to secure the number of TDM lines that can be used for each route. The purpose of. Disclosure of the invention

For this reason, the bucket method of the present invention comprises a transmitting device capable of transmitting a bucket having encoded voice information and transmission destination information to a line, and a transmitting device connected to the line and transmitted from a transmitting β device. A relay $ 1 device that can send the bucket $ 5 to other devices based on the destination information of the bucket, and a receiving device that can receive the bucket connected to the line and restore the voice information! ^ A bucket for voice communication with the device で 1 method, comprising: a calling side synchronization step in which the calling side transfer device and the relay transfer device synchronize on the line control channel and transmit / receive packets on the line voice channel. The relay transfer device and the destination $ ^ device synchronize on the control channel. The receiving-side synchronization step of transmitting and receiving packets over the voice channel, and voice information from the received packet Loopback connection determination step for detecting that the restored voice information is input from the switchback via the same path, and transmitting the recovered voice information to the exchange, and a loopback connection determination step If the input is determined to be a loopback input, the bucket is assembled and disassembled in the relay teii device; ^ A direct communication step in which the packet is transmitted and received between the calling device and the called device without being performed. It is characterized by having been configured with.

Therefore, in this way, the path of the audio bucket is shortened, so that useless restoration of the audio signal is not performed and deterioration of the sound quality does not occur.

Further, the relay t ^ device of the present invention is connected to an exchange for exchanging bucketed voice information and a bucket line, and receives the bucket transmitted by the transmitting side fiber device and receives the bucket. The relay that sends the bucket to the destination device indicated by the destination information of the device! Synchronization detection means that performs synchronization detection using the synchronization signal set in the line control channel. In addition, the originating transfer device and the receiving transfer device receive the notification of the completion of the change of the destination information sent by the control channel, respectively, and the audio information is restored from the bucket received by the audio channel of the line, and the restored information is restored. Receiving means for transmitting voice information to the exchange; return connection determining means for detecting that the restored voice information is transmitted to the exchange and returned to the repeater via the same route from the exchange; and If the loopback connection determination means determines that the input is a loopback input, the packet is transmitted and received between the calling side transfer device and the destination side device without the packet being split and disassembled in the relay device. It is characterized in that it is configured with a direct it "setting means for making settings.

Therefore, in this case, the ≤ path of the voice bucket becomes the shortest path, so that no matter how many steps of the relay exchange power is performed, the bucket is assembled and disassembled only once, and the delay time is reduced. The advantage is that high voice quality can be obtained.

Further, the direct communication authorization means is a caller! ^ A first destination change requesting means for requesting the device to change the destination information indicated by the bucket to the destination! ^ Device; A second transmission destination requesting means for requesting the device to change the destination information indicated by the packet to the source β device, and a relay device between the source device and the destination fe¾ device. Can be configured to send and receive packets without going through It is.

Therefore, in this way, no matter how many steps of the relay exchange power are performed, the compression and decompression and decoding of the voice information are performed only once, so that the delay time can be reduced and the deterioration of the voice quality can be reduced. There is an advantage that can be reduced.

Then, the direct communication (1) determining means changes the destination information indicated by the packet transmitted by the transmitting device to the destination device, and transmits the destination information indicated by the packet transmitted by the receiving device. It may be configured as a bucket bridging means for changing the information to the source i device.

Therefore, in this case, the voice bucket must be disassembled and reassembled only once, so that there is an advantage that the quality can be obtained without deterioration in sound quality and delay.

Also, the calling side transfer device of the present invention is a calling side fe device connected to an exchange for exchanging bucketed voice information and a bucket line, and changes destination information. In particular, receiving means that can extract a destination change request from a packet transmitted by another i-device on the line control channel, and extract and transmit new destination information included in the destination change request A destination changing means for changing the destination information of the bucket to be replaced with new destination information, and converting the voice information from the exchange into a bucket and transmitting it on the line voice channel, and changing to the new destination information. It is characterized in that it is provided with a transmission means capable of notifying the user of the fact through a control channel.

Therefore, in this case, the path of the voice bucket becomes the shortest path, so that no matter how many relay exchanges are performed, the bucket is assembled and disassembled only once, so that the delay time is reduced, High 利点 There is an advantage that voice quality can be obtained.

Also, the destination device of the present invention is a destination device connected to an exchange for exchanging packetized voice information and a line for a packet feii, and includes destination information. Receiving means for extracting a destination change request from a packet transmitted by the other device on the line control channel to change the packet, and restoring voice information from a packet received by itself on the line voice channel; and New destination information included in the destination change request is extracted and the destination information of the packet to be transmitted can be changed to the new destination information, and new destination information has been changed to the new destination information. This is characterized by comprising transmission means capable of notifying the above via a control channel. Therefore, in this way, no matter how many relay exchanges are performed, the audio information is compressed and decompressed and decoded only once, ensuring high call quality regardless of the presence or absence of a relay connection. There are advantages that can be done.

Further, the bucket communication system according to the present invention comprises: an originating device capable of transmitting a bucket having encoded voice information and transmission 5fet information to a line; and another device connected to the line and indicated by destination information. A bucket communication system comprising a relay device capable of receiving the packet and a receiving device connected to the line and capable of receiving the received packet and restoring the voice information. Receiving means capable of extracting a destination change request from a packet transmitted by the relay device on the line control channel in order to change the destination information, and extracting and transmitting new destination information included in the destination change request. Transmission of packets to be sent Destination change means that can change the blue report to the new destination information, and convert the voice information from the exchange into a packet and send it on the line's voice channel. A transmission means capable of notifying the change to the destination information on the control channel is provided, and the receiving side transfer device sets the relay transposition force to change the destination information <the request for the destination change from the bucket transmitted on the control channel. Means for extracting voice information and recovering voice information from the packet delivered to itself by voice channel, and the destination of the packet to extract and send the new destination information included in the destination change request The relay transfer device is provided with a destination change means capable of changing the information to the new destination and the destination information, and a transmission means capable of notifying the new L and the destination information by the control channel. A synchronization detecting means for performing synchronization detection using a control channel synchronization signal, and receiving a change completion notification of the destination information transmitted by the transmitting and receiving side transfer devices on the control channel, respectively. A receiving means for restoring voice information from the bucket received on the voice channel and sending the recovered voice information to the exchange, and the restored voice information is returned to the repeater from the exchange via the same path and is input to the repeater. The return connection determination means capable of detecting the ruling, and when the return connection determination means determines that the input is the return input, the transmission destination information indicated by the bucket is changed to the destination device by the source device. And a destination change requesting means for requesting the destination device to change the destination information indicated by the packet to the source device. Therefore, in this way, it is not necessary to perform detailed transfer information setting operation in each transfer device, and it is not necessary to set conditions, and a voice communication system that can be easily operated can be obtained. However, operation equivalent to the existing network can be performed.

Then, the bucket communication system of the present invention comprises: a transmitting side device capable of transmitting a bucket having coded voice information and transmission destination information to a line; and another fem- ber connected to the line and indicating transmission destination information power. ^ A bucket communication system comprising a relay device capable of performing a bucket on the device and a receiving device # 1 connected to a line and capable of receiving a $ 5 packet and recovering voice information. The side device extracts the destination change request from the packet sent by the relay device on the line control channel to change the destination information, and extracts the new destination information included in the destination change request. Destination change means that can change the destination information of the packet to be transmitted and transmitted to the new destination information, and convert the voice information from the exchange into a packet and transmit it on the voice channel of the line.ゝIt has a transmission means that can notify the change of the destination information on the control channel, and the receiving device relays the destination information to change it.¾1 Device power <Destination change request from packet sent on control channel As well as arriving at your voice channel. Receiving means capable of restoring voice information from a packet, and destination change capable of extracting new destination information included in a destination change request and changing the destination information of a packet to be transmitted to the new destination information A relay unit that performs synchronization detection by using a control channel synchronization signal; and a transmission side. The device and the destination $ 5 device receive the change completion notification of the destination information sent on the control channel, respectively, restore the voice information from the bucket received on the voice channel, and send the recovered voice information to the exchange. Receiving means for performing a return connection determination means capable of detecting that the restored voice information is input from the exchange back to the relay fe device via the same path; If the connection judging means judges that the input is a return input, the destination information indicated by the bucket sent by the calling side transfer device is changed to the called side device, the connection is made, and the receiving side device output is transmitted. Change the destination information indicated by the packet to the originating transfer device and provide packet relay means that can do it! It is characterized by having been constituted.

Therefore, in this way, it is possible to systematically estimate and operate the number of lines available for each route, and it is possible to use a voice communication system that is highly efficient and has high affinity with existing networks. Become like BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a configuration diagram of a voice communication system according to the first embodiment of the present invention.

FIG. 2 is a functional block diagram of a transmission group according to the first embodiment of the present invention. FIG. 3 is a format diagram of a communication message between gateways according to the first embodiment of the present invention.

FIG. 4 is an area layout diagram of the channel state management table according to the first embodiment of the present invention.

FIG. 5 is a diagram showing an example of use of the channel state management table according to the first embodiment of the present invention.

FIG. 6 is a sequence diagram showing switching and switching back of the voice bucket channel according to the first embodiment of the present invention.

FIG. 7 is a configuration diagram of a voice communication system according to the second embodiment of the present invention.

FIG. 8 is a sequence diagram showing switching of a voice packet / route according to the second embodiment of the present invention.

FIG. 9 is a configuration diagram of a voice communication system according to a first modification of the second embodiment of the present invention.

FIG. 10 is a sequence diagram illustrating voice bucket <(path switching) according to a first modification of the second embodiment of the present invention.

FIG. 11 is a configuration diagram of a voice communication system according to a second modification of the second embodiment of the present invention.

FIG. 12 is a configuration diagram of a conventional voice communication system.

FIG. 13 is an explanatory diagram of the folded connection. BEST MODE FOR CARRYING OUT THE INVENTION (A) Description of the first embodiment of the present invention

FIG. 1 is a configuration diagram of a voice communication system according to the first embodiment of the present invention. The voice communication system 60 shown in FIG. 1 is a system for transmitting voice information over a LAN or WAN, and includes a transmission group 61 a, a relay group 61 b, and a reception group. —It is composed of 6 1 c and LA NZWAN 2.

Here, L ANZWA N 2 is a line composed of a local area network or a wide area network connecting these transmission group 61a, relay group 61b, and reception group 61c. The devices in the network are connected to the full mesh via the LANNZWAN2, and the voice bucket is transmitted and received in real time.

The transmission group 61 a is for converting voice information into an IP packet and transmitting it as a voice bucket, and includes an extension telephone 4 a, an exchange la, and a gateway 3 a. . Here, the extension telephone 4a is, for example, an extension telephone in a company building, and the exchange 1a is a time-division multiplexing apparatus for accessing from the extension telephone 4a and a plurality of other extension telephones (not shown). This is processed using the fi¾ ”method and replaced with an extension telephone housed in another exchange.

The exchange 1a and the gateway 3a are connected via a voice data path (voice channel) shown by a dotted line in FIG. 1 and a control signal path (control channel) shown by a solid line. They are connected, and multiple symbols are transmitted and received using time-division polymorphism. Then, for example, when a call is made from extension telephone 4a to an extension telephone accommodated in another exchange, exchange 1a analyzes the dialed digits when it recognizes the connection request from the dialing statement. , And sends a call setup message to the gateway 3a via the control signal path.

Here, the audio information includes fax data and data using an audio frequency band in addition to the audio signal, unless otherwise specified. The first embodiment and the second embodiment described later The same meaning is used in the first modified example and the second modified example of the second embodiment.

Further, the gateway 3a is a calling side switch connected to the exchange 1a for exchanging voice information converted into an IP packet and the LAN / WAN 2 for the IP packet ^ ¾. The transmitting device includes a receiving unit 100a, a voice bucket destination changing unit (destination changing unit) 12, and a transmitting unit 101a.

Here, the receiving means 100a can extract a destination change request from an IP bucket transmitted by another β device on the control signal path of LAN ZWAN 2 in order to change the destination information. The voice packet transmission destination changing means 12 can extract new transmission destination information included in the transmission destination change request and change the transmission destination information of the IP packet to be transmitted to the new transmission destination information. is there. The transmission means 101a converts the voice information from the exchange 1a into an IP packet and sends it out on the voice data path of the LANZWAN2, and also informs the control signal path that the new information has been changed to the destination information. Will be notified.

As a result, the gateway 3a compresses and encodes the PCM signal input through the TDM line, breaks it down into IP packets, passes it to the IP layer, and passes the IP bucket passed from the IP layer. After assembling, the PCM signal is decompressed and converted to a PCM signal, and the PCM signal is sent to the exchange 1a. In other words, the gateway 3a interfaces the TDM interface and the LAN interface.

Next, the relay group 6 lb, which performs a voice bucket on β¾, includes a gateway 3 b, an extension telephone 4 b, and an exchange 1 b. Here, the gateway 3b is connected to the exchange 1b for exchanging IP packetized voice information and to the LAN / WAN 2 for the IP packet fe, and sends out the gateway 3a. A relay device that receives an IP bucket and can transmit the IP bucket to the gateway 3c indicated by the destination information of the IP bucket. The relay device includes: a synchronization detection unit 102; a reception unit 100b; It comprises connection determination means 10 and voice bucket transmission destination change notification means 11.

Here, the synchronization detecting means 102 performs synchronization detection using a synchronization signal set in the control signal path of the LANZWAN 2, and the receiving means 100b includes the gateways 3a and 3a. The gateway 3c receives the notification of the completion of the change of the destination information sent on the control signal path, and restores the audio information from the IP bucket received on the audio data path of LAZWAN 2, and restores the restored information. Voice information to switch 1 Is to be sent.

The loopback connection determination means 10 can detect that the restored voice information is transmitted to the exchange 1b and is returned to the gateway 3b via the same route from the exchange 1b. is there. Here, the loopback input means that in the case of transit switching, the restored audio signal is sent to the exchange 1b, and the restored audio signal is again looped back from the exchange 1b through the same route and exchanged. 1b, and may be referred to as a loopback connection in the following description of the first embodiment, the second embodiment, and each modified example. Note that this relay exchange means that the extension telephone 4a of the exchange 1a and the extension telephone 4b of the exchange 1b are in a call state once, and then another extension telephone is operated by! ^ Operation of the extension telephone 4b. This is an exchange in which calls are routed to the extension telephone 4c described below.

Further, the voice bucket transmission destination change notifying means 11 does not perform the assembly and disassembly of the IP bucket in the gateway 3b when the return connection determination means 10 determines that the input is a return input. The setting is performed so that IP packets are transmitted and received between the gateway 3a and the gateway 3c.

In addition, the voice bucket destination change notifying unit 11 includes a first destination change request unit 11a and a second destination change request unit 11b. The first destination change request means 1 la requests the gateway 3 a to change the destination information indicated by the IP packet to the gateway 3 c, and the second destination change request means 1 la 11b requests the gateway 3c to change the destination information indicated by the IP packet to the gateway 3a. The IP bucket power is transmitted and received between the gateway 3a and the gateway 3c without passing through the gateway 3b.

The voice bucket destination change notification unit 11 functions as a direct communication unit, and its function is realized by a channel state management table 50 described later.

The extension telephone 4b and the exchange 1b are the same as the extension telephone 4a and the exchange 1a, respectively, and further description is omitted.

As a result, the gateway 3b loops the audio signal path during the relay exchange. When the connection is recognized, the voice bucket destination change notification means 11 is used to notify the gateways 3a and 3c of the change in the destination of the voice packet. Thus, the voice bucket prompts direct transmission and reception between the gateway 3a and 3c.

Next, the reception group 61c, which receives a voice bucket, includes a gateway 3, an extension telephone 4c, and an exchange 1c. This gateway 3c is a receiving side connected to an exchange 1c for exchanging voice information converted into an IP packet and a LANZWAN 2 for an IP bucket fe! It comprises a voice packet transmission destination change means (destination change means) 12 and a transmission means 101c.

Here, the receiving means 100c extracts the destination change request from the IP packet transmitted by the other device on the control signal path of the LAN ZWAN 2 to change the destination information, and It can restore the IP bucket power and other voice information that arrived at the user via the voice data overnight route. The voice bucket destination changing means 12 is capable of extracting the new transmission 5fe blue information included in the destination change request and changing the destination information of the IP packet to be transmitted to the new destination information. The transmitting means 101c can notify the change to the new destination information via the control signal path. That is, when the gateway 3a is notified of the change of the destination of the voice bucket, the gateway 3a transmits the voice bucket to the instructed destination, that is, the gateway 3c, and the gateway 3c transmits the voice bucket to the gateway 3c. Transmit voice packet to gateway 3a.

The extension telephone 4b and the exchange 1b are the same as the extension telephone 4a and the exchange 1a, respectively, so that further description is omitted.

Therefore, the bucket communication system 60 is connected to the LAN / WAN 2 and transmits the IP bucket having the encoded voice information and the destination information to the LAN / WAN 2. A gateway 3b capable of receiving the packet to the other transfer device indicated by the destination information and a gateway 3c capable of receiving the routed IP packet connected to the LANZWAN 2 and recovering the voice information are provided. It will be configured.

As a result, the gateway 3a is connected to the gateway 3a through the gateway 3b. The IP bucket method of voice input to 3c is as follows. First, when the caller dials the called party's telephone number on the extension 4a, the exchange 1a analyzes the dialed number, and the exchange number of the exchange 1c accommodating the called party's extension 4c. The gateway 3c corresponding to the IP address is generated strongly. Next, the voice information, the IP address, and the power are input to the gateway 3 a via the voice data path and the control signal path, respectively, and the gateway 3 a receives the IP bucket power and the gateway 3 a. It is routed to c.

That is, the gateway 3a and the gateway 3b synchronize with each other on the control signal path of the LAN / WAN 2, and the voice signal is transmitted. The gateway 3b and the gateway 3c synchronize on the control signal path and transmit and receive the voice packet on the voice data path of the LAN ZWAN 2 (destination side). Sync step). This control signal path is set by sending and receiving signaling messages over TCP connections. In addition, from now on, the relay synchronization force of both the relay synchronization between the gateways 3a and 3b and the relay synchronization between the gateways 3b and 3c will be established.

Next, the gateway 3b restores the voice information from the received IP packet, and the restored voice information is sent to the exchange 1b, and the restored audio information is transmitted from the exchange 1b to the same location. It is detected that a loopback input has been made through the route (loopback connection determination step).

If it is determined in this return connection determination step that the input is a return input, the voice bucket is not assembled and disassembled in the gateway 3b, and the gateway 3b is connected between the gateway 3a and the gateway 3c. The voice bucket is transmitted / received in (direct communication step).

As described above, in all of the gateways 3a, 3b, and 3c, the route of the signaling message and the fe route of the voice data are not “joined”, and the route of the voice bucket is shortened. Therefore, the audio signal is not restored in any number of stages, so that the sound quality does not deteriorate and the audio delay does not occur.

Next, referring to FIG. 2, the hardware and the functions of the above-mentioned loopback connection determination means 10, voice bucket destination change notification means 11, and voice bucket destination change means 12 are described. The relationship will be described. FIG. 2 is a functional block diagram of a relay group 6 lb according to the first embodiment of the present invention. The relay group 6 1 b shown in FIG. 2 includes an exchange 1 b, a gateway 3 b, and a connection line 4 3 b and 5 and are connected to LAN / WA N2. Note that the configuration shown in FIG. 2 is the same in the transmission group 61 a and the reception group 61 c. Further, in the first embodiment and the second modification of the second embodiment and the second embodiment, And so on.

The switchboard 1b shown in FIG. 2 includes circuit circuits (trunk circuits) 24a and 24b and a network circuit (NW) 23. The line circuit 24a is connected to the extension telephone 4b, and performs outgoing call detection of the extension telephone 4b, transmission of a voice signal and an incoming call signal, billing, and the like. The line circuit 24b is connected to the gateway 3b, and forms a pseudo-communication path for each of a plurality of channels such as channels 1 and 2. Further, the network circuit 23 is connected to the line circuit 24b to generate a pseudo call path according to the call.

The gateway 3b shown in FIG. 2 includes a line circuit 24c, a codec control unit 20a, 20b, a CP Central Processing Unit 21, and a storage unit (MM: main unit). It is composed of a memory) 22 and a LAN controller (LANC: LAN controller) 25, which are connected by a bus 43a. The line circuit 24c is connected to the line circuit 24a on the side of the exchange 1b, and establishes a pseudo communication path for each of a plurality of channels.

Further, the codec control unit 20a compresses and encodes the audio signal to generate an audio frame, decomposes the audio frame, inputs the audio frame into a plurality of IP buckets as audio data, and receives the received IP bucket. In this method, audio data is extracted from the audio data, an audio frame is generated by threading the audio data, and the audio frame is decompressed and decoded to be restored as an audio signal. Further, the codec control unit 20b has a similar function. That is, these codec controllers 20a and 20b respectively function as audio compression code expansion / decompression decoders. These codec controllers 20a and 20b can extract the numbers identifying the IP buckets, physical channels, and the like as the channel numbers.

Specifically, the codec control unit 20a includes a coder 31a, a decoder 30a, It has a bit stealing circuit 32a and a relay synchronization detecting circuit 33a. Here, the coder 31a compresses and encodes the audio signal input from the line circuit 24c to generate an audio frame, and the decoder 30a receives the audio signal from the LANNZN2 side. The audio data extracted from the IP packet is assembled, decompressed and decoded to generate an audio frame.

Further, the bit stealing circuit 32a inserts a dial number and a relay synchronization timing into the exchange 1b through an individual signal line. That is, the bit stealing circuit 32a inserts a dialing numeral and a relay synchronization timing in a PCM signal as an itM capability for transmission to the exchange 1b. Specifically, the bit steal circuit 32a is periodically relayed to the LSB (Least Significant Bit) of the PCM signal decompressed and decoded by the decoder, for example, once every four frames. Signal bits for synchronization detection are inserted so that signaling (relay synchronization) can be performed. A TDMZA TM multiplexing fe¾ device (not shown) detects the transit exchange status in exchange 1b and outputs (code-through) without codec, or outputs the cell as it is. (Sell-through) can also be used as a means to select

The relay synchronization detection circuit 33a extracts the dial number and the relay synchronization timing from the PCM signal sent from the exchange 1b, and receives the individual signal from the PCM signal as a reception from the exchange 1. It decodes the dial digits feathered by the line and detects the relay synchronization bits periodically included in the PCM signal. Specifically, the relay synchronization detection circuit 33a monitors the LSB of the PCM signal, notifies the CPU 21 by an interrupt or the like when the relay synchronization is detected, and similarly executes the CPU when the relay synchronization is lost. 21 is notified, and functions as the synchronization detecting means 102.

Further, the function of the loopback connection determination means 10 is realized by the cooperation of the bit stealing circuit 32a and the relay synchronization detection circuit 33a.

The codec control unit 2 Ob is the same as the codec control unit 20a, and includes a coder 31b, a decoder 30b, a bit stealing circuit 32b, and a relay synchronization detecting circuit 33b. has b. And coder 3 1b corresponds to coder 3 1a and decoder 30 b corresponds to the decoder 30a, the bit steal circuit 32b corresponds to the bit steal circuit 32a, and the relay synchronization detection circuit 33b corresponds to the relay synchronization detection circuit 33a. The explanation given above is omitted.

Further, the storage unit 22 is a memory such as a RAM (Random Access Memory), for example, and includes a channel state management table (channel information management table) 50, a voice frame buffer 51, a voice packet buffer 52, and a message transmission / reception. It consists of each area of buffer 53. The channel state management table 50 is a table for managing the connection state of the channel, and will be described later in detail. The voice frame buffer 51, the voice bucket buffer 52, and the message transmission / reception buffer 53 are buffers required for transmission / reception operations. These may be provided in different storage devices.

The CPU 21 functions as a call control unit 40, a TCP / IP control unit 42, and a voice packet control unit 41 by cooperating with the storage unit 22. Here, the call control unit 40 searches the channel state management table 50 based on the channel numbers extracted by the codec control units 20a and 20b, and sets the relay synchronization state. The PZ IP control unit 42 performs transmission control and the like.

Further, the voice bucket control unit 41 holds timing for selecting a code loop or a sell-through, and includes a voice frame transmitted and received via the codec control unit 20a (20b), It has a format conversion function for voice and packets transmitted and received from LANZWAN2 via TCPZIP control unit 42. Further, when assembling the voice bucket from the voice frame subjected to the compression encoding and transmitting the voice bucket to the LAN / WAN 2, the voice bucket control unit 41 specifies the IP specified by the call control unit 40 as the destination information. Address and UDP port number. The function of the voice packet transmission destination change notifying means 11 in the gateway 3b and the function of the voice packet transmission destination changing means 12 in the gateways 3a, 3c are as follows. These call control units 40, voice bucket control unit 41, TCP / IP control unit 42, channel state management table 50, voice frame buffer 51, voice packet cuffer 52, message transmission / reception sofa 53 This is realized by working together. Further, the bus 43a is a bus line for connecting these components, respectively, and includes the above-described codec control units 20a and 2Ob, the CPU 21, the storage unit 22, and the LAN control unit 25. Are electrically connected to each other. The LAN control unit 25 controls LANZWAN 2.

The coder 31a (or 31b), the CPU 21, the storage unit 22, and the LIN control unit 25 function in cooperation with each other and function as the transmitting means 1Ola and 101c. Further, the decoder 30a (or 30b), the CPU 21, the storage unit 22, and the LAN control unit 25 function as receiving means 100a, 100b, and 100c in cooperation with each other. FIG. 3 is a format diagram of a communication message between gateways according to the first embodiment of the present invention. The content of the information included in the format shown in FIG. 3 is called a message and is used for basic layer 3 call control. This message is generated in the message transmission / reception buffer 53 when the TCPZIP control unit 42 gives an instruction to another gateway to change the transmission destination. The format shown in FIG. 3 is the same in a second embodiment described later and each modification of the second embodiment. This message is routed between the user's network or the user's user in order to realize the layer 3 function, and thus has, for example, a call setup message, a disconnection recovery message, and a global call number message. The information included in the format shown in FIG. 3 has an IP header, a header of a TCP header, and the following four contents (i) to (iV).

(i) Message type

Q. 931 messages between gateways.

(ii) Command type

Voice bucket destination change instruction (change notification) or voice bucket destination change response.

(i i i)

IP address and UDP port number

(i V) New destination information

IP address and UDP port number By using this communication message, in a relay exchange, each gateway can operate in cooperation with each other, and change the transmission destination of the voice packet regardless of the sequence of transmitting and receiving the signaling message when setting up a call. Because of this, it is possible to prevent the deterioration of sound quality and delay increase due to the multistage relay of the voice bucket.

Using these, a process of decomposing an audio signal into IP buckets for transmission on a plurality of channels and a process of restoring the audio signal from the IP buckets are performed. The transmission process (for channel 1) is as follows. First, the voice signal is input from the line circuit 24b in the exchange 1b to the codec control unit 20a, and the coder 31a compresses and encodes the voice signal. The data subjected to the compression encoding is written by the CPU 21 as an audio frame into the audio frame buffer 51, then converted into an IP packet and transmitted to the LANNZAN 2.

Thus, when a call is made from the extension telephone 4b, the message is detected in the line circuit 24a in the exchange lb, and a channel number is assigned in the network circuit 23 (for example, channel 1). When the voice signal is input to the line circuit 24b and the gateway 3b, the IP bucket is ^^ as described above, and the LAN The data is sent to LANZWAN 2 via the control circuit 25, the connection line 43b, and the router 5.

On the other hand, the restoration process is as follows. That is, the IP bucket input from the LAN control unit 25 is written into the voice bucket buffer 52, and the CPU 21 extracts voice data from the written IP bucket, and the voice packet is extracted. The written audio data is written to the audio frame buffer 51. Then, in the audio frame buffer 51, the decomposed audio data is assembled and converted into an audio frame; the audio frame is decompressed and decoded by the decoder 30a, and the audio signal is again input. As will be restored.

Thus, the IP packet received from LANZWAN 2 via the router 5 and the LAN control unit 25 is first stored in the storage unit 22 and subjected to the voice After the information has been restored, the gate circuit 3b circuit circuit 2 4c The power is input to the circuit 24b in the exchange 1b. Then, in the exchange lb, the signal is distributed to the line circuit 24a via the network circuit 23, and the incoming signal is transmitted to the line circuit 24a and the extension telephone 4b. It will be sent out and a voice call will be possible.

The exchanges l a and 1 c and the gateways 3 a and 3 c are also processed in the same manner as the exchanges l b and the gateway 3 b. Next, a method of using the channel state management table 50 in which ± ίβ has been set will be described. The channel state management table 50 manages the connection state of the channel and implements the function of the voice packet transmission destination change notification unit 11.

FIG. 4 is an area arrangement diagram of the channel state management table 50 according to the first embodiment of the present invention. In the channel state management table 50 shown in FIG. 4, areas are assigned by channel numbers, and information as shown in the following (1) to (4) is written in each area. The region 50a shown in FIG. 4 is an example for channel 1. That is,

① Channel prone

In order to manage the connection status between the gateway 3a, the gateway 3c, and the gateway 3b, the channel between the gateway 3a and the gateway 3b and between the gateway 3b and the gateway 3c is controlled. It can indicate whether the connection status is idle Z use, Z relay use (relay exchange), and functions as a channel state management unit.

② Relay synchronization status

The information indicates whether the synchronization direction of the channel is in the up / down / bi-directional or out-of-sync state.

③Relay channel number

The channel number determined to be the loopback input can be displayed for the channel that is looped back and functions as a relay channel number management unit.

④ LAN reception channel information (UDP port number)

Displays information for receiving an IP bucket. This UDP port The number is a unique reception number logically set for each channel.

⑤ L A N side transmission channel information (IP address and UDP port number)

Displays information for transmitting an IP packet.

Although other information is also included, detailed description thereof will be omitted. Further, the contents shown in FIG. 4 are the same in a second embodiment described later and each modification of the second embodiment.

As a result, the gateway 3a determines the IP address of the gateway 3c as destination information based on the called number in the call setup message, sets up a TCP connection as a control signal path, and then sets up the call setup message. To gateway 3c. Then, the gateway 3b routes the message sent from the gateway 3a, and the gateway 3c sends the IP address and the UDP port number of the gateway 3c in the call setup response message. It stores the destination information of the voice bucket consisting of and performs iS @. At this time, similarly, the gateway 3a also stores and sends the destination information of the voice bucket including the IP address and the UDP port number of the gateway 3a in the call setup message.

In addition, after the link is set, a signaling message is transmitted and received between the gateway 3a and the gateway 3c via the TCP connection, and the voice packet is transmitted. Data is transmitted and received in both directions using UDP. Then, a plurality of exchanges 1 a, 1 b, 1 c are connected to L NZWAN 2 and communication is possible.

FIG. 5 is a diagram showing a usage example of the channel status management table according to the first embodiment of the present invention. In FIG. 5, the channel depression management tables 65a, 65b, 65c, 65d and the channel depression management tables 66a, 66b, 66c, 66d are shown. Eight types are shown. Here, the channel state management tables 65a and 65b are states in which voice information is transmitted and received between the gateways 3a and 3b, respectively, and the channel state management tables 65c and 65d. Is a state in which voice information is transmitted and received between the gateways 3b and 3c, respectively, and corresponds to a state in which relay synchronization is not detected. On the other hand, the channel state management tables 66 a, 66 b, 66 c, and 66 d respectively correspond to states in which relay synchronization is detected. Things. Note that the contents shown in FIG. 5 are the same in a second embodiment described later and each modified example of the second embodiment.

First, when the relay synchronization is not detected, the gateways 3a and 3b transmit and receive each other on the channel 1, and the gateways 3b and 3c transmit and receive each other on the channel 2. That is, the channel state management table 65a and the channel state management table 65b are paired, and the channel state management table 65c and the channel state management table 65d are paired. I have.

Here, the IP address and the UDP port number (for example, 1234) of the gateway 3b are forcibly written in the LAN-side transmission channel information of the channel status management table 65a, and the channel status management table 65a. In the LAN side reception channel information of b, the UDP port number (1234) of the gateway 3a is written. On the other hand, the IP address of the gateway 3a, the UDP port number (for example, 1025) and the data are written in the LAN-side transmission channel information of the channel status management table 65b, and the information is written in the channel status management table 65a. In the LAN reception channel information, the UDP port number (1025) of gateway 3b is written.

Similarly, the IP address of the gateway 3c and the UDP port number (for example, 55555) are written in the LAN-side transmission channel information of the channel status management table 65c, and the LAN-side reception channel information of the channel status table 65d. The UDP port number (55555) is written in the channel information. On the other hand, the IP address and the UDP port number (for example, 2222) of the gateway 3b are written in the transmission channel information on the LAN side of the channel state management table 65d, and the channel state management table 65c is included in the channel state management table 65c. A UDP port number (2222) is written in the LAN reception channel information.

Next, in the case of transit exchange, the gateway 3a relays the IP packet transmitted on the channel 1 to the gateway 3b, and the IP bucket is transmitted from the gateway 3b to the gateway 3c. Sent on channel 2. That is, when the relay synchronization is detected in the TCP connection, the channel 1 between the gateways 3a and 3b and the channel 2 between the gateways 3b and 3c are linked. For this reason, of the channel state management tables 66 a, 66 b, 66 c, and 66 d, In the channel status management tables 66b and 66c, the channel status is displayed as relay use indicating relay exchange, and the relay synchronization status is displayed as bidirectional. The relay channel number in the channel state management table 66b is channel 2, and the relay channel number in the channel state management table 66c is channel 1.

Then, the IP address of the gateway 3c, the UDP port number (55555) and the power are written in the LAN side transmission channel information of the channel state management table 66a, and the LAN side of the channel state management table 66d is written. In the received channel information, the UDP port number (55555) of the gateway 3a is written strongly.

On the other hand, the IP address of the gateway 3a and the UDP port number (1025) are written in the LAN-side transmission channel information of the channel state management table 65d, and the channel state management table is also written. The UDP port number (1025) of the gateway 3c is written in the LAN-side reception channel information of 65a.

Thus, the IP bucket is directly transmitted and received as a pair of transmission and reception with each other in the channel state management tables 66a and 66d. The underlined part is rewritten according to the situation according to the contents of the switching and switching back of the voice bucket transmission path. Switching back means that synchronization is re-established if the relay synchronization force is lost.

With such a configuration, a direct telephone call is made with the extension telephone 4a of the exchange 1a and the extension telephone 4b of the exchange 1b, and once a call is established, the extension telephone 4b is operated by operating the extension telephone 4b. 4 If the call is routed to c, the call will be routed directly. Ket {5} Route switching and switching back are performed.

FIG. 6 is a sequence diagram showing the switching and switching back of the voice packet route according to the first embodiment of the present invention, wherein the steps (S1a to S15b) and the gateway 3a, 3b, 3c are performed. The signal message (W1 to W8) transmitted and received between the three parties is strongly displayed.

First, in step S1a shown in FIG. 6, synchronization between the gateways 3a and 3b is established to transmit and receive messages, and in step S1b, the gateways 3b and 3b 3 Synchronization between c is established and messages can be sent and received. Will be Note that steps before these steps S 1 a and S 1 b correspond to a state in which relay synchronization is not detected. For example, the above-described channel status management tables 65 a, 65 b, 65 c, 65 d Powerfully used. On the other hand, when the relay synchronization is detected in steps S1a and S1b, for example, the above-mentioned channel status management tables 66a, 66b, 66c and 66d are used.

Then, in step S1c, when the CPU 21 of the gateway 3b is notified of the detection of the relay synchronization by the codec control unit 20, the CPU 21 performs the call control unit 40, and the call control unit 40 Searches the channel state management table 50 with the channel number (the number for identifying the physical channel of the codec control unit 20) and sets the relay synchronization state. Next, in step S2, the gateway 3b creates a destination change notification message (see FIG. 5) in the message transmission / reception buffer 53, and as the destination change request message W1, sets the TC PZ IP The control unit 42 sends the packet to the gateway 3a using a TCP connection (first destination change request step).

Here, in step S3, the call control unit 40 of the gateway 3a receives the destination change request message W1 transmitted from the gateway 3b. Then, in step S4, the call control unit 40 of the gateway 3a rewrites the transmission port information of the channel state management table 50 to the gateway 3c for communication, and performs voice bucket control. The voice packet control unit 41 instructs the unit 41 to change the transmission destination. The voice packet control unit 41 converts the format between the voice frame and the voice bucket, and transmits the specified IP address and UDP port number to the gateway 3. c, and sends a first change completion notification message W2 to notify the completion of the change to the gateway 3b, and the gateway 3b sends the first change completion notification message The first W2 is received (first change completion notification step). In FIG. 6, the first change completion notification message W2 sent from the gateway 3a is the force input in step S2, which indicates a reply (acknowledge). The same applies to the following steps S7, S11, and S14.

Next, in step S5, a message transmission / reception capability for changing the destination is similarly performed between the gateways 3b and 3c. In other words, the gateway 3b requests the gateway 3c to change the receiver information, Sends message W3 (recipient information change request step).

Further, in step S6, the control unit 40 of the gateway 3c receives the destination information change request message W3 from the gateway 3b, and in step S7, The call control unit 40 of c rewrites the transmission port information in the channel status management table 50 to the gateway 3a for communicating, and instructs the voice packet control unit 41 to change the transmission destination. Voice packet control unit 4 1 Change the specified IP address and UDP port number to gateway 3a, and notify gateway 3b of the completion of the change, and complete the second change. The notification message W4 is transmitted, and the gateway 3a receives the second change completion notification message W4 (second change completion notification step).

Thus, in step S7z, relay exchange is performed between the gateway 3a and the gateway 3c, and direct transmission and reception are performed. In other words, transmission and reception are performed directly without assembling and disassembling the IP bucket in the gateway 3b (transmission and reception step).

Next, the switching back process upon detection of the relay out-of-synchronization is performed according to the same sequence.

First, in step S8, the relay synchronization is lost in the gateway 3b.If it is detected, the channel state management table 50 is searched, and the relay synchronization state of the lost channel number is determined. Be changed.

Next, in step S9, the destination change notification message W5 is transmitted from the gateway 3b to the gateway 3a. Here, in step S10, when the gateway 3a receives the destination change notification message W5 from the gateway 3b, in step SI1, the channel state management table 50 of the gateway 3a is received. The transmission port information is rewritten to the communicating gateway 3c, and the voice bucket control unit 41 performs a format conversion between the voice frame and the voice bucket, and calls as the destination information. Change to the IP address and UDP port number specified by control unit 40. Then, the gateway 3a sends a first change completion notification message W6 to the gateway 3b, and the gateway 3b receives the first change completion notification message W6. Similarly, in step S12, the gateway 3b sends a destination change notification message W7 to the gateway 3, and in step S13, the call control unit 4 of the gateway 3c 0 means that the destination change notification message W7 is received from the gateway 3b. Then, in step S14, the transmission port information of the channel status management table 50 is rewritten to the communicating gateway 3a, and the audio data is output. The packet controller 41 is instructed to change the transmission destination. The voice bucket control unit 41 sets the IP address and the UDP port number designated by the call control unit 40 as transmission destination information, and sends the second change completion notification message W to the gateway 3b. 8 and the gateway 3b receives the second change completion notification message W8. Then, in step S15a, synchronization is established between the gateway 3a and the gateway 3b, and in step S15b, between the gateway 3b and the gateway 3c again. Synchronization is established. That is, relay synchronization is established between the gateways 3a and 3b.

In this way, since the voice packet becomes the shortest path of β¾ path, no matter how many relay exchanges are performed, the assembly and disassembly of the IΡ packet is performed only once, and the same m¾ as when there is no relay exchange power. Since the delay time is used, the delay time power due to fluctuation absorption is reduced compared to the case without relay exchange.

Also, in this way, no matter how many steps of the relay exchange are performed, the compression coding and decompression decoding of the PCM signal are performed only once, so that the same voice quality as that without the relay exchange is obtained. As a result, voice quality is not degraded as compared with the case without relay switching.

Further, in this way, the communication quality can be ensured regardless of the presence or absence of the relay connection. Therefore, it is not necessary to set the routing information at the gateway, and it is possible to obtain a system that is easy to operate. In addition, by simulating the opposite connection like a trunk line using a TDM line, it is not necessary to set detailed routing conditions and digit erasure reproduction conditions in each gateway. It is possible to perform the same operation as a network using.

In addition, in this way, the number of lines available for each route can be systematically estimated and operated, so that it is highly efficient and has an affinity with networks designed based on TDM lines. In the future, providing voice communication systems has become a powerhouse, With high affinity with the network, a voice communication system can be used. Further, by increasing the utilization of the voice communication system, reduction of communication costs will be promoted.

(B) Description of the second embodiment of the present invention

FIG. 7 is a configuration diagram of a voice communication system according to the second embodiment of the present invention. The voice communication system 60a shown in FIG. 7 is a system that fits voice in an IP packet using LAN or WAN, and includes a transmission group 61a ', a relay group 61b', and a reception group. 6 1 c 'and L ANZWAN 2.

The gateway 3a 'in the transmission group 6 1a' is different from the gateway 3a of the first embodiment, and similarly, the gateway 3b in the relay group 6 lb ' 'It is different from the gateway 3b of the first embodiment, and is different from the gateway 3c in the receiving group 61c'. In addition, other extension telephones 4a and exchanges 1a in transmission group 6 1a ', extension telephones 4b and exchanges 1b in relay group 6 1b', and reception groups 6 1 ' The extension telephone 4c and the exchange 1c are the same as those obtained by ± ίδ, respectively, and further description will be omitted. Further, LAN / WAN 2 has the same functions as those described above.

The gateway 3a 'in the transmission group 6 1a' is connected to the exchange 1a for exchanging voice information converted into an IP packet and the LAN ZWAN 2 for the IP packet fe¾. The apparatus comprises a receiving means 100a, a transmitting means 101a, and a voice bucket destination changing means 12.

Here, the receiving means 100a is capable of extracting a destination change request from the IP packet transmitted by the gateway 3b 'on the control channel of LANZWAN 2 in order to change the destination information. a can convert the voice information from the exchange 1a into an IP packet and send it out on the voice data path of LAZWAN2, and also notify the change to the new destination information on the control signal path (control channel). It is a thing. The voice bucket destination changing means 12 extracts the new destination information included in the destination change request and updates the destination information of the IP bucket to be transmitted. It can be changed to the destination information.

The software of the gateway 3a 'is the same as that of the gateway 3a (see FIG. 2), and the function of the transmitting means 101a is the same as that of the above-mentioned coder 3 la (or 3 lb). ), CPU 21, storage unit 22, LAN control unit 25. Further, the function of the receiving means 100a is realized by the cooperation of the above-mentioned decoder 30a (or 30b) CPU 21, storage section 22, LAN control section 25, and voice bucket transmission destination changing means. The functions of 12 include a call control unit 40, a voice packet control unit 41, a TCP / IP control unit 42, a channel state management table 50, a voice frame buffer 51, a voice packet buffer 52, a message transmission / reception buffer 53, and a strong cooperation. This has been achieved.

The exchange 1a and the gateway 3a 'are connected via a voice data path (voice data path) shown by a dotted line in FIG. 7 and a control signal path shown by a solid line in FIG. Multiplexing is performed using time-division multiple S¾. Then, for example, when a call is made from the extension telephone 4a to an extension telephone in another group (for example, the extension telephone 4c), when the exchange 1a recognizes the connection request, the exchange 1a dials out of the message. Analyze the digits and send a call setup message to the gateway 3a 'via the control signal path.

Further, the gateway 3a 'compresses and encodes the PCM signal input from the exchange 1a via the TDM line, decomposes the PCM signal into an IP packet, passes the packet to the IP layer, and passes the IP layer power. After assembling the IP and packets, the data is decompressed and decoded, converted to PCM signals, and sent to the exchange 1a.

Next, the gateway 3 b 'in the relay group 61 b' is connected to the exchange 1 b for exchanging the IP packetized voice information and the LANZWA N 2 for the IP bucket ^ ¾, and the gateway 3 a It is a relay # 1 device that receives an IP packet that has been sent out strongly and can transfer the IP packet to the gateway 3c indicated by the destination information of the IP packet. The gateway 3 b ′ includes a synchronization detecting means 102, a receiving means 100 b, a loopback connection judging means 10, and a voice bucket relay means 13.

Here, the synchronization detecting means 102 detects the synchronization using the synchronization signal of the control signal path. The receiving means 100b receives the notification of the completion of the change of the destination information sent by the gateway 3a 'and the gateway 3c' on the control signal path, and the IP packet received on the voice data path. And restores the restored voice information to the exchange 1b. The loopback connection determination means 10 can detect that the restored voice information is loopback-input from the exchange 1b to the gateway 3b 'through the same route.

When the loopback connection judging means 10 determines that the input is a loopback, the voice bucket relay means 13 outputs the destination information indicated by the IP bucket which has been transmitted from the gateway 3a 'to the gateway 3c. To the gateway 3c, and the destination information indicated by the transmitted IP packet is changed to the gateway 3a for transmission. I have.

Further, the hardware of the gateway 3b 'is the same as the hardware of the gateway 3b, and is the same as that described with reference to FIG. 2. The functions of the above-described units are as follows. Is realized. That is, the function of the synchronization detection means 102 is realized by the relay synchronization detection circuit 33a, and the function of the reception means 100b is the function of the decoder 30a (or 3 Ob), the CPU 21, the storage unit 22, the LAN This is realized by the control unit 25 working together. The function of the loopback connection determination means 10 is realized by cooperating with the bit steel circuit 32a and the relay synchronization detection circuit 33a. In addition, the functions of the voice packet relay means 13 include a call control unit 40, a voice bucket control unit 41, a TCP / IP control unit 42, a channel state management table 50, a voice frame buffer 51, and a voice packet. The buffer 52 and the message transmission / reception buffer 53 are realized by cooperating strongly.

As a result, when the gateway 3b 'recognizes that the loopback connection judging means 10 has established the voice paska loopback connection in the exchange 1b, the voice packet relay means 13 transmits the gateway 3a' forcefully. The destination information of the voice packet is rewritten to the gateway 3c 'and transmitted to LANZWAN2 again. Similarly, the voice packet relay means 13 is transmitted to the gateway 3' by the destination of the powerfully transmitted voice bucket. The information is rewritten to the gateway 3a 'and sent to LANZWAN2. Further, the gateway 3c 'in the receiving group 61c' is connected to the exchange 1c for exchanging the IP packetized voice information and the LAN / WAN 2 for the IP bucket feii. Wearing side! ^ A device, comprising a receiving means 100c, a voice bucket destination changing means 12, and a transmitting means 101c. Here, the receiving means 100c extracts the destination change request from the IP packet transmitted by the gateway 3b 'through the power control signal path so that the gateway 3c' changes the destination information. In addition, the voice information can be restored from the IP packet delivered to itself via the voice data path, and the voice bucket destination changing means 12 extracts the new destination information included in the destination change request. It is possible to change the destination information of the IP bucket to be transmitted to the new destination information. Further, the transmission means 101c can notify the change to the new L ゝ transmission destination information via a control signal path.

The hardware of the gateway 3 is the same as the hardware of the gateway 3c, and is the same as that described with reference to FIG. The function of the transmitting means 101c is realized by cooperation of the above coder 31a (or 31b), the CPU 21, the storage unit 22, the LAN control unit 25, and the function of the receiving means 100c is realized. The decoder 30 a (or 30 b), the CPU 21, the storage unit 22, and the LAN control unit 25 are implemented in cooperation with each other, and the functions of the voice bucket transmission destination change unit 12 are the call control unit 40, the voice bucket Control unit 41, TCP / IP control unit 42, channel state management table 50, voice frame buffer 51, voice bucket buffer 52, message transmission / reception buffer 53 Is done. Note that the components shown in FIG. 7 and having the same reference numerals as those described in the first embodiment have the same functions, and further description will be omitted.

Therefore, the bucket communication system 60a includes a gateway 3a ′ that can transmit an IP bucket having coded voice information and destination information to LANZWAN2, and a destination information connected to LAN / WAN2. Gateway 3b 'that can send the IP packet to another device that displays the signal, and gateway 3c that can receive the routed IP packet connected to LAN / WAN 2 and restore the voice information. '. As a result, the flow of the audio data follows the path shown by the dotted line in FIG. In other words, the data that has been called by the extension telephone 4a within the transmission group 61a 'is input to the gateway 3a' via the exchange 1a. Then, in the gateway 3a ', based on the called number in the call setup message, the IP address of the gateway 3c' is determined as transmission destination information, and the TCP connection is set as a control signal path. Then, the call setup message is sent to the gateway 3c ', and the call setup message is received by the gateway 3b'. When the gateway 3 b ′ receives the message and recognizes that the voice path power loopback connection is established at the exchange 1 b, the voice bucket relay means 13 sends the gateway 3 a ′ vigorously. The destination information of the voice packet is rewritten to the gateway 3c ', and the voice packet is transmitted to the LAN / WAN 2 again without performing assembling processing as voice data. Further, the gateway 3c 'receives the voice bucket, assembles the voice signal, sends it to the exchange 1c, and sends the switch 1c power to the extension telephone 4c. The audio signal arrives.

As described above, since the route change of the voice packet is used for the communication procedure between gateways, the switching power becomes shorter in a shorter time.

Also, as described above, none of the gateways 3a ', 3b', and 3c 'make the feii path of the signaling message and the path of the voice data “joined”, and furthermore, the β¾ path of the voice bucket. Since the audio signal is shortened and unnecessary voice signal restoration is not performed, the sound quality does not deteriorate. In other words, the gateway 3b, which is a medium, is routed directly as it is to the IP bucket without performing the 'decomposition of the received voice packet' and assembling and compressing and decompressing the decompressed voice packet. Multistage relaying of buckets is not performed, and sound quality degradation and delay increase do not occur.

With such a configuration, the extension telephone 4a of the exchange 1a and the extension telephone 4b of the exchange 1b make a direct call, and once the communication state is established, the! ^ Operation of the extension telephone 4b is performed. When the call is routed to the extension telephone 4c, the voice bucket ^ ¾ path is switched by the direct communication setting means.

FIG. 8 is a sequence diagram illustrating switching of the voice packet channel according to the second embodiment of the present invention. First, in step T1a shown in FIG. 8, synchronization is established between the gateways 3a 'and 3b' to transmit and receive messages. In step T1b, the gateways 3b 'and 3c 'Synchronization is established and messages are sent and received. Then, in step Tic, when synchronization between the gateways 3 a ′ and 3 b ′ and synchronization between the gateways 3 b ′ and 3 c are established, the codec control unit 20 detects relay synchronization from the CPU 21. Then, the CPU 21 performs the call control unit 40, and the call control unit 40 searches the channel control table 50 by the channel number and sets the relay synchronization status.

Next, in step T2, the gateway 3b 'sends a voice /, to the voice bucket control unit 41. The voice packet control unit 41 instructs the packet relay, and the voice packet control unit 41 does not disassemble the received IP packet, but obtains the IP address and the UDP port number of the IP packet transmitted and output by the gateway 3a '. Change to one-way 3c 'and send the changed IP packet to LANZWAN2 via TCPZIP control unit 42 (first address change step). In addition, the voice packet control unit 41 of the gateway 3b 'transmits the IP address and the UDP port number of the IP packet transmitted by the gateway 3c' without disassembling the received IP packet. Change to 3a 'and send the changed IP bucket to LANZWAN2 via TCPZIP control unit 42 (second address change step). In this way, the IP bucket is directly transmitted and received between the gateway 3a 'and the gateway 3c' without assembling and disassembling the IP bucket.

In this way, the communication quality can be ensured regardless of the presence or absence of the relay exchange. In addition, it is possible to obtain a system that is easy to operate without requiring the gateway 3b 'routing. In other words, by connecting each gateway in a pseudo-opposite manner like a trunk line using a TDM line, it is not necessary to set detailed routing conditions and digit erasure reproduction conditions in each gateway, and the TDM line The operational ability is no different from that of the network using Internet.

In addition, since the number of lines available for each route can be systematically estimated and operated in this way, voice is highly efficient and has high affinity with networks designed based on TDM lines. Providing a communication system has become a powerhouse, This makes it possible to use a voice communication system having high affinity with the network. Further, by increasing the utilization of the voice communication system, reduction in communication costs will be promoted.

(B 1) Description of First Modification of Second Embodiment

The IP packet can also be transmitted by combining the first embodiment and the second embodiment.

FIG. 9 is a configuration diagram of a voice communication system according to a first modification of the second embodiment of the present invention. The voice communication system 6 Ob shown in FIG. It is a system that feathers in packets. Here, the voice communication system 60b differs from the voice communication system 60a of the second embodiment in that the gateway 3b 'in the transmission group 6lb' is notified of the voice bucket destination change notification. That is, means 11 is added. That is, the gateway 3b 'includes a synchronization detecting means 102, a receiving means 100b, a loopback connection judging means 10, a voice packet relay means 13, and a voice packet transmission destination change notifying means 11. It is configured for some reason.

The other components are the same as those described in the above-described second embodiment, and further description will be omitted.

With such a configuration, the extension telephone 4a of the exchange 1a and the extension telephone 4b of the exchange 1b make a direct call, and once in the talk state, the extension telephone 4b performs a transfer operation. When the call is routed to the extension telephone 4c, the call is switched to the direct route (the voice bucket fe route is switched by the discriminating means. FIG. 10 shows the voice according to the first modification of the second embodiment of the present invention). FIG. 9 is a sequence diagram showing switching of a packet transmission path, which is transmitted and received between three steps: steps (T1a to T8z) and gateways 3a ', 3b', and 3c '. A signal message (W21 to W24) is displayed, where Steps Tla, Tib, T1c and Step T2 are the same as those described in the second embodiment.

That is, first, synchronization is established between the gateways 3a 'and 3b' and messages are transmitted and received (step Tla), and synchronization between the gateways 3b 'and 3c' is established and messages are transmitted. Transmission and reception (step T lb) When the synchronization between the gateways 3a 'and 3b' and the synchronization between the gateways 3b 'and 3c' are established, the call control unit 40 searches the channel state management table 50 by the channel number. Then, the relay synchronization state is set (step T lc).

Next, in step T2, the gateway 3b 'instructs the voice bucket control section 41 to relay the voice bucket, and the gateway 3a' is controlled by the voice bucket control section 41. The IP address and UDP port number of the transmitted IP bucket are changed to the gateway 3c ', and the received IP bucket is not disassembled, and the changed IP bucket LAN / WAN 2 Sent to Similarly, the gateway 3b 'instructs the voice bucket control unit 41 to perform voice bucket relay, and the voice bucket control unit 41 uses the gateway 3c' to transmit the IP bucket that has been forcibly transmitted. The IP address and the UDP port number are changed to the gateway 3a ', the received IP bucket is not disassembled, and the changed IP bucket is sent to LANZ WAN 2.

Further, in step T3, transmission / reception of a destination change request message is performed between the gateways 3a 'and 3b'. That is, the destination change request message W21 is created on the message transmission / reception buffer 53, and the call control unit 40 of the gateway 3b 'sends the destination change request message W2 to the gateway 3a'. 1 is transmitted by the TCP / IP control unit 42 using a TCP connection.

Subsequently, in step T4, upon receiving the destination change request message W21 from the gateway 3b ', the call control unit 40 of the gateway 3a' receives the transmission port in the channel state management table 50. The packet information is rewritten to the communicating gateway 3c ', and in step T5, the voice bucket control unit 41 is instructed to change the transmission destination. Further, the voice bucket control unit 41 performs a format conversion between the voice frame and the voice bucket, sets the designated IP address and the UDP port number, and sets the gateway 3a 'to the gateway. The first change completion notification message W22 is sent to the gateway 3b ', and the gateway 3b' receives the first change completion notification message W22. In FIG. 10, the first change completion notification message W22 sent from the gateway 3a 'is the one input in step T3, which indicates a reply (acknowledge). The same applies to step T 8 below It is.

Similarly, in step T6, the gateway 3b 'sends a destination change request message W23 to the gateway 3c' so as to change the destination to the gateway 3a '. Send using a TCP connection. Then, in step T7, when the gateway 3c 'receives the destination change request message W23 from the gateway 3b', the gateway 3c 'transmits the transmission port information of the channel state management table 50. Rewrite the gateway 3a 'to communicate.

Next, in step T8, the voice bucket control unit 41 is instructed to change the transmission destination, and the voice bucket control unit 41 converts the format between the voice frame and the voice bucket. And set the IP address and UDP port number specified by the call control unit 40. Then, the gateway 3c 'notifies the gateway 3b' of the second change completion notification message W24, and the gateway 3b 'transmits the second change completion notification message W2. Receive.

In this way, in step T8z, the relay synchronization is established between the gateway 3a 'and the gateway 3c', and direct transmission and reception are performed, so that the transmission fiber length of the voice bucket becomes the shortest, There is an advantage that the delay at β¾ is reduced. In addition, since there is no need for a communication procedure between the gateways for changing the route of the voice bucket, switching can be made shorter and in a shorter time.

When the gateway 3 b ′ detects the relay synchronization in this way, first, the operation of routing the audio bucket without decoding is started, and thereafter, the gateway 3 c ′ and the gateway 3 c are started. ', A destination change request message is sent, and the gateway 3a' and the gateway 3c 'transit to a state of transmitting and receiving a voice bucket. It is a power function that shifts to a connection state in which the loss of a bucket is minimized and the sound quality is reduced and delay is reduced. In this way, high communication quality can be ensured regardless of the presence or absence of relay exchange, and a system that is easy to operate can be obtained. In addition, detailed routing conditions and digit erasure reproduction conditions for each gateway This eliminates the need for configuration, and facilitates network operation. Furthermore, it is highly efficient, has a high affinity with existing networks, and can use a voice communication system. Increased usage will help reduce communication costs.

(B2) Description of a second modification of the second embodiment

In the voice communication system described in the second embodiment, the same switching sequence is performed even when there are a plurality of relay devices.

FIG. 11 is a configuration diagram of a voice communication system according to a second modification of the second embodiment of the present invention. The voice communication system 60c shown in FIG. 11 is a system for transmitting voice over an IP packet using a LAN or WAN. The relay group 6c in the voice communication system 60a (see FIG. 7) is used. A relay group 6 1 d is provided between 1 b ′ and the reception group 6 1 c ′. Here, ϋ¾ is input to the gateway 3 via the gateway 3 b ′ and the gateway 3 d.

The gateway 3 b ′ includes synchronization detection means 102, reception means 100 Ob, loopback connection determination means 10, voice bucket relay means 13, and voice bucket destination change notification means 11 1. It can be used to perform relay operations and to be able to transit directly to sending and receiving.

Further, the relay group 61d is connected to the extension telephone 4d, the exchange 1d for exchanging voice information converted into an IP packet, and the originating device connected to the exchange 1d and the LAN ZWAN 2. It receives the IP packet transmitted by the IP packet, and the destination feather device indicated by the destination information of the IP packet is provided with a gateway 3d capable of transmitting the IP packet. The gateway 3d includes synchronization detecting means 102, receiving means 100b, loopback connection judging means 10, voice bucket relay means 13 and voice bucket destination change notifying means. It is configured with 11 and can perform relay operations and can transit to the state of direct transmission and reception.

Otherwise, components having the same reference numerals as those described above are the same as those described above, and further description will be omitted.

Here, the destination of the IP bucket shown in FIG. 11 is from the gateway 3 a ′ to the gateway 3, and is directly transmitted between the gateway 3 a ′ and the gateway 3 d { This shows a state in which the destination information of the received IP bucket is rewritten by the gateway 3d after the 1 setting is performed. That is, the number of relay stages is two, and the IP bucket force transmitted from the gateway 3a 'is routed in the gateway 3b', which is the first relay device, and the second stage. In the gateway 3d, which is the relay transfer device, the second routing is performed and the gateway 3c 'receives it.

With such a configuration, the extension telephone 4a of the exchange 1a and the extension telephone 4b of the exchange lb directly communicate with each other, and once in a talk state, the extension telephone 4b is operated by the fe¾ operation of the extension telephone 4b. When the call is routed to 4c, the voice bucket path is switched by the direct communication {1} setting means.

First, the IP packet transmitted from the gateway 3a 'is received by the gateway 3b', and the return connection determination means 10 within the gateway 3b 'is output by the switch 1b. If it is detected that the connection is looped back, an operation to rewrite only the destination information without decoding the voice packet is started. Then, after that, a destination change request message is sent to the gateway 3b ', the gateway 3a' and the gateway 3d, and the gateway 3a 'and the gateway 3d are transmitted. The state transits to the state of transmitting and receiving a direct voice bucket.

Further, in the gateway 3d, when the received IP packet is judged to have a loopback connection determination means 10 0 ^^ exchange 1d, the voice path power is << return connection, and the voice packet relay is performed. By means 13, the destination information of the voice and packet received from the gateway 3 b ′ is rewritten to the gateway 3 c ′ and transmitted to the LANZWAN 2. Similarly, the gateway 3 d rewrites the destination information of the voice bucket received from the gateway 3 to the gateway 3 a ′ and sends it to L ANZWA N 2. Send out. After that, the gateway 3d sends a destination change request message to the gateway 3a 'and the gateway 3c', and the gateway 3a 'and the gateway 3c' communicate with each other. The state transits to the state of transmitting and receiving a straight voice packet.

Thus, in addition to the advantages of the first modified example of the first, second, and second embodiments, even when a plurality of gateways 3 b ′, 3 (one car is performed) However, it is important to obtain high-quality sound without deterioration and delay. In addition, in this way, only the control signal in the control signal path is switched while the audio path is connected, so that only the audio data path can be routed without the time required for changing the destination. Become like

(C) Other

Note that the return connection determination means 10 in the first embodiment, the second embodiment, the first modified example of the second embodiment, and the second modified example of the second embodiment includes the gateway 3b, 3b ', In addition to 3d itself, the exchange 1b, Id side detects the loopback connection and sends it to the gateway 3b, 3b ', 3d via a control signal path such as an individual signal line. You may make it notify. In addition, other detection modes are also possible, and these do not impair the superiority of the present invention.

Further, in the first, second, and first modified examples of the second embodiment and the second modified example of the second embodiment, the channel state management table 50, the voice frame buffer 51, the voice bucket Each area of the data buffer 5 2 and the message transmission / reception buffer 53 is used to divide the memory area in one storage unit 22.A plurality of memories are prepared, and individual areas are allocated to these memories. You can also.

Furthermore, the exchanges 1a, 1b, 1c, 1d are not limited to TDM lines, and if they handle bucket-like ones, they can be exchanged with the gateways 3a, 3b, 3d. It is also possible to connect to c, 3a ', 3b', 3c ', 3d.

As described above, the line in each embodiment and each modified example is a local area network or a wide area network, and the wide area network is between local area networks and between local area networks and terminal devices. This is a network that combines three types of sections, that is, an area and terminal equipment / terminal equipment, and also encompasses a single-calorie network. Industrial applicability

As described above, according to the present invention, irrespective of the number of relay stages of the voice bucket, the routing in the relay transfer device becomes unnecessary, so that the voice bucket is disassembled and assembled only once, and the sound quality is poor. In addition, the transmission path of the voice bucket is minimized, so that the delay in the transmission path can be reduced, and high communication quality can be ensured. O

In addition, new operation is possible without making any changes or improvements to the existing network using TDM lines, and compatibility with networks designed based on existing TDM lines This makes it possible to realize a voice communication system with high performance and has the advantage of obtaining a system that is easy to operate. Furthermore, the increase in the use of this voice communication system will promote a reduction in communication costs as compared to the case where public telephone lines are used.

Claims

The scope of the claims

1. A transmitting side device (3a, 3a ') capable of transmitting a packet having coded voice information and destination information to a line (2); and a device connected to the line (2) and connected to the line (2). Originating transfer device (3a, 3a ') Relay device (3b, 3b', 3b ', 3b', which can transfer the packet to another fe device based on the destination information of the packet transmitted from the source device) 3d) and the receiving side that can receive the bucket connected to the line (2) and restore the voice information! ¾ Device (3c, 3c ') A bucket fei method to do,

The source device (3a, 3a ') and the relay fei device (3b, 3b', 3d) are synchronized with the control channel of the line (2) and the packet is transmitted to the line (2). 2) a calling-side synchronization step for transmitting and receiving on the voice channel

The relay! ^ Synchronize the device (3b, 3b ', 3d) with the destination transfer device (3c, 3c') on the control channel. A destination synchronization step for transmitting and receiving a packet on the voice channel;

The relay fiber device (3b, 3b ', 3d) reconstructs the voice information from the received packet, sends the reconstructed voice information to the exchange (1b, Id), and transmits the reconstructed voice information to the exchange (1b, Id). 1b, Id) through the same route through the same route to detect that the restored voice information has been input back,

If it is determined in the return connection determination step that the input is a return input, the thread 5 of the packet in the relay device (3b, 3b ', 3d) is not subjected to the disassembling force, and the transmission side ^ i is not performed. Between the device (3a, 3a ') and the receiving device (3c, 3c'). A bucket method comprising a direct communication step for transmitting and receiving a packet.

2. The direct communication step comprises:

The relay device (3b, 3b ', 3d) sends a destination change request to the source device (3a, 3a') to request the destination information to be changed. 1 Destination change request step, The source β¾ device (3a, 3a ') receives the destination change request and transmits the destination information of the bucket to be transmitted to the destination fe device (3c, 3c'). ), And a first change completion notification step of sending a first change completion notification to notify the relay fe device (3b, 3b ', 3d) of the completion of the change;

The relay fiber device (3b, 3b ', 3d) strongly receives the first change completion notification to notify the destination transfer device (3c, 3c') of the change of the destination information. A destination information change request step for sending a destination information change request to be requested;

The wearing side! ^ Device (3c, 3c ') By receiving the destination information change request, it is possible to change its own destination information to the source $ 5 device (3a, 3a'). 2 Change completion notification step,

Assembling of the bucket in the transmitting side # 1 device (3a, 3a '), the receiving side fe device (3c, 3c') and the relay transfer device (3b, 3b ', 3d) 2. The bucket method according to claim 1, further comprising a transmission / reception step of transmitting / receiving the bucket without disassembly.

3. The direct communication step comprises:

The relay device (3b, 3b ', 3d) transmits the destination information of the bucket transmitted from the transmitting device (3a, 3a') to the receiving device (3c, 3c, 3d). 3c '), and a first address change step for sending the changed bucket to the line (2).

The relay device (3b, 3b ', 3d) sends the destination information of the bucket sent from the destination device (3c, 3c') to the source device (3a , 3a '), and a second address reordering step for sending the changed bucket to the line (2). Packet sewing method.

4. The packet transfer method according to any one of claims 1 to 3, wherein the line (2) is a local area network.

5. Connected to the exchange (1b, Id) that exchanges the packetized voice information and the packet line (2), and sends out the calling device (3a, 3a ') as much as possible. A relay device (3b, 3b ', 3d) capable of receiving the packet and indicating the destination information of the packet and indicating the packet to the device (3c3c'). Synchronization detection means (102) for performing synchronization detection using a synchronization signal set on the control channel of the line (2);

The originating side transfer device (3a, 3a ') and the destination side transfer device (3c, 3c') respectively receive the notification of the completion of the change of the destination information transmitted on the control channel, and Receiving means (100b) for restoring the voice information from the bucket received on the voice channel of the line (2) and transmitting the recovered voice information to the exchange (lb, Id); and The voice information is sent to the exchange (lb, Id) and is returned from the exchange (lb, Id) to the relay te¾ device (3b, 3b ', 3d) via the same route. Connection determination means (10) capable of detecting that

If the return connection determination means (10) determines that the input is a return input, the relay device (3b, 3b ', 3d) does not assemble or disassemble the packet, and the caller! ^ Device (3a, 3a ') and the destination side! ^ Direct communication (1¾ setting means (11, 13) A relay # 1 device characterized by comprising:

6. The direct measurement means (11)

A first destination change request for requesting the source side! ^ Device (3a, 3a ') to change the destination information indicated by the bucket to the destination side transfer device (3c3) Means (11a)

Second destination change requesting the destination fe device (3c, 3c ') to change the destination information indicated by the bucket to the source transfer device (3a, 3a') With request means (lib)

Between the source $ 5¾ device (3a, 3a ') and the destination device (3c, 3c') without passing through the relay transfer device (3b, 3b ', 3d). 6. The relay transfer device according to claim 5, wherein the relay transfer device is configured to transmit and receive the packet.

7. The direct communication determination means (1 3)

The sending side device (3a, 3a ') changes the destination information indicated by the bucket transmitted to the receiving side device (3c, 3c'), and performs β while changing the destination information. (3c, 3) Change the destination information indicated by the bucket that has transmitted the information to the source device (3a, 3a ')! 6. The relay β device according to claim 5, wherein the relay β device is configured as a bucket relay means (13).

8. Direct communication 手段 Certification means (1, 1, 13)

The source f ^ device (3a, 3a '), the destination! ^ In order to manage the connection status between the device (3c, 3c ') and the relay device (3b, 3b', 3d), at least the source fe¾ device (3a, 3a ') - the relay device (3 b, 3 b ', 3 d) between the said relay ϋ¾ device (3 b, 3 b', 3 d) '該着side device (3 c, 3 c ^f) with and between connection There is a channel control unit that can display whether the status is empty, in use, or relay use, and a relay channel number management unit that can display the channel number determined to be the return input.

Claims characterized by comprising a channel information management table (50, 65a, 65b, 65c, 65d, 66a, 66b, 66c, 66d) having Item 8. The relay transfer device according to item 6 or 7.

9. The relay device according to claim 5, wherein said line (2) is a local area network.

10. An originating transfer device (3a, 3a ') connected to an exchange (lb, 1d) for exchanging bucketed voice information and a line <2 for bucket <. And

Receiving means (100a) capable of extracting a destination change request from a packet transmitted by another device on the control channel of the line (2) in order to change the destination information;

'ヽ ° Ket to extract and send the new destination information included in the destination change request Destination change means (12) capable of changing a blue report to the new destination information; and a bucket for converting the voice information of the exchanges (lb, Id), etc. into a sound of the line (2). A transmitting means (101a) for transmitting on the voice channel and notifying on the control channel that the new destination information has been changed. .

11. The originating transfer apparatus according to claim 10, wherein said line (2) is a powerful local area network.

12. A destination transfer device (3c3c ') connected to the exchange (1b, 1d) that exchanges the bucketed voice information and the bucket transmission line (2). ,

In order to change the destination information, another device extracts the destination change request from the packet sent out on the control channel of the line (2), and sends the request to itself via the voice channel of the line (2). Receiving means (100c) capable of restoring voice information from the received bucket, extracting new destination information included in the destination change request, and changing the destination information of the bucket to be transmitted to the new destination information. Transmission destination changing means (12), and transmission means capable of notifying on the control channel that the new destination has been changed to transmission destination information.

(101 c). A receiving side fe¾ device characterized by comprising:

13. The receiving-side transfer device according to claim 12, wherein said line (2) is a spoken area network.

14. A source device (3a, 3 3 ') capable of transmitting a bucket having coded voice information and destination information to a line (2), and a destination device connected to the line (2) and connected to the destination device. A relay device (3b, 3b ', 3d) capable of transmitting the packet to another device indicating information capability; and receiving the packet connected to the line (2) and receiving the voice information. A bucket communication system (60, 60b) provided with a receiving side device (3c3c ') capable of restoring the The originating device (3a, 3a ')

The relay device (3b, 3b ', 3d) for changing the transmission destination information. A receiving means (3) capable of extracting a transmission destination change request from a packet transmitted through a control channel of the line (2). 100 a)

Destination change means (12) for extracting new destination information included in the destination change request and changing the destination information of a bucket to be transmitted to the new destination information; and the exchange (lb, A transmitting means (101) which converts the voice information from Id) into a bucket and transmits it on the voice channel of the line (2), and which can notify the control channel of the change to the new destination information. a) with

The receiving device (3c, 3c ') is strong,

In order to change the destination information, the relay device (3b, 3b ', 3d) extracts a destination change request from the packet sent out by the control channel, and sends the request to itself by the voice channel. Reply to Receiving means (100c) capable of restoring the voice information from the packet;

Destination change means (12) for extracting the new transmission feet information included in the transmission destination change request and changing the transmission destination information of the bucket to be transmitted to the new transmission destination information; And transmission means (101c) capable of notifying on the control channel that the transmission has been changed to the transmission green information,

The relay device (3b, 3b ', 3d)

Synchronization detection means (102) for performing synchronization detection using the synchronization signal of the control channel;

The source device (3a, 3a ') and the destination device (3c, 3c') respectively receive the notification of the completion of the change of the destination information transmitted on the control channel, and Receiving means (100b) for restoring the voice information from the packet received in step (b) and sending the recovered voice information to the exchange (lb, Id);

A loop that can detect that the restored voice information is loop-input from the exchange (lb, Id) to the relay # 1 device (3b, 3b ', 3d) via the same route. Connection determination means (10);

If the return connection determination means (10) determines that the input is a return input, The calling side 51 device (3a, 3a ') is requested to change the destination information indicated by the bucket to the receiving side device (3c, 3c'), and the destination side fe # is requested. Transmission destination change request means (1 1 a, 3) for requesting the device (3c, 3c ') to change the destination information indicated by the bucket to the source device (3a, 3a'). A bucket communication system, comprising: 1 1 b).

15. A source device (3a, 3a ') capable of transmitting a packet having coded voice information and destination information to a line (2), and connected to the line (2) for the transmission. A relay transfer device (3b, 3, 3d) capable of transmitting the bucket to another feii device indicated by the preceding information, and receiving the voiced bucket connected to the line (2) and receiving the voice information. A packet communication system (60a, 60b, 60c) with a destination fe¾ device (3c, 3c ') that can restore

The outgoing device (3a, 3a ') is

The relay device (3b, 3b ', 3d) for changing the transmission destination information, receiving means for extracting a transmission destination change request from a packet transmitted through a control channel of the line (2). 1 00 a)

Destination change means (12) for extracting new destination information included in the destination change request and changing the destination information of a packet to be transmitted to the new destination information; and the exchange (lb, I transmitting means (10 1 a) capable of converting the voice information from d) into a bucket, transmitting the packet on the voice channel of the line (2), and notifying the control channel of the change to the new destination information. With

The receiving device (3 c 3 c ') force,

In order to change the destination information, the relay device (3b, 3b ', 3d) extracts a destination change request from the packet transmitted by the control channel, and addresses the destination by the voice channel. Receiving means (100 c) capable of restoring the voice information from the bucket arriving at

Destination change means (12) for extracting new destination information included in the destination change request and changing the destination information of a packet to be transmitted to the new destination information; and the new destination information. Transmitting means capable of notifying that the change has been made to the control channel (1 0 1 c)

The relay device (3 b, 3 b ', 3 d)

Synchronization detection means (1 0 2) for performing synchronization detection using the synchronization signal of the control channel;

The originating device (3a, 3a '), the destination! ^ Each of the devices (3c, 3c ') receives the notification of the completion of the change of the destination information transmitted on the control channel, and also restores the audio information from the packet received on the audio channel and restores the same. Receiving means (100b) for sending the selected voice information to the exchange (lb, Id);

A loop connection that can detect that the restored voice information is loop-input from the exchange (lb, Id) to the repeater (3b, 3b ', 3d) through the same route. Determination means (10);

If the loopback connection determination means (10) determines that the input is a loopback input, the transmitting side device (3a, 3a ') transmits the destination information indicated by the bucket which has been transmitted strongly to the receiving side. ! ^ Change to a device (3c3)! At the same time, the destination fe¾ device (3c, 3c ') can change the destination information indicated by the bucket transmitted to the calling device! A bucket communication system comprising a bucket relay means (13).

16. The bucket communication system according to claim 14, wherein the line (2) is a local area network.