JP2004112651A - Lan telephone system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a LAN telephone system capable of attaining voice connection without applying a load to a network when connecting voice such as a tone or announcement or the like, and connecting the voice announcement to a LAN telephone set, even when the communication of PBX itself and a communication with PBX are stopped or become abnormal. <P>SOLUTION: A voice server 101 is arranged in a segment arranged LAN telephone sets 102 to 104 or the like. A broadcast packet is used for a communication between LAN telephone sets 102 to 104 and the voice server 101. The packet between all LAN telephone sets 102 to 104 and the voice server 101 in the same segment is shared. Thus, voice connection can be attained while suppressing an increase in the number of packets of LAN. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a LAN (Local Area Network) telephone system, and more particularly, to a user (user) using a telephone receiving a tone such as a dial tone / ringing tone / busy tone / hold tone from a handset and an announcement from a switchboard. The present invention relates to a LAN telephone system for transmitting voice.
[0002]
[Prior art]
FIG. 12 is a block diagram showing a configuration of a tone and announcement transmission system in a conventional PBX (private branch exchange) using a time division switch (hereinafter referred to as TDSW). The PBX 200 is configured to connect a time slot 210 specified in advance to the telephone 211 and to transmit a sound source 209 in the PBX 200 to the telephone 211 under the control of a CPU (central processing unit) 201. The PBX 200 includes a memory 202, a register 203, a trunk 204, a line circuit 205, a DTG 207, and an SPM 208 in addition to the CPU 201, the TDSW 206, and the sound source 209 described above.
[0003]
Further, there is a system in which a digital tone is provided in a telephone and tone transmission is performed (for example, see Patent Document 1). That is, as shown in the block diagram of FIG. 13, this audible signal sound transmission method is such that a digital audible sound source (TONE) 221, an address circuit (ADR) 222, a control circuit (CONT) 223, and a parallel / serial conversion circuit ( P / S) 224, a communication transmission / reception circuit (VCKT) 225, a PCM code modulator / demodulator (CODEC) 226, an insertion circuit (INS) 227, and an interface circuit (INF) 228. In accordance with the tone transmission command code from the PBX, the digital audible tone generator 221 reads data obtained by PCM-encoding the tone for transmitting the corresponding tone. Then, the signal is demodulated into an analog signal by the PCM modulator / demodulator 226, and a voice is transmitted to the subscriber by the communication transmitting / receiving circuit 225.
[0004]
[Patent Document 1]
JP-A-60-143057 (page 2-3, FIG. 2)
[0005]
Further, there is a voice relay and multiplexing device as an example of a system for reducing a communication processing load in voice relay in an IP (Internet Protocol) network (for example, see Patent Document 2). In this device, a voice signal input from a telephone network is converted into a voice packet by a voice relaying and multiplexing device on a transmitting side. Then, voice packets having different destinations are concatenated into one packet, and then broadcast to a plurality of voice relay and multiplexing devices using IP multicast communication or IP broadcast packet communication. The voice relaying and multiplexing device on the receiving side extracts only the voice packet addressed to itself, restores it to voice, and outputs it to the telephone network.
[0006]
[Patent Document 2]
JP 2001-24703 A (page 4-5, FIG. 3)
[0007]
[Problems to be solved by the invention]
The above-described related art has several problems as follows. First, when a tone or announcement sound source in the PBX is transmitted to a LAN telephone via a LAN, it is necessary to limit the number of simultaneous connections. The reason is that, when a PBX having tone and announcement sound sources and a LAN telephone establish a session and perform one-to-one unicast communication, the number of sessions and the number of voice packets increase as multiple LAN telephones connect to the PBX. Increase. Therefore, the load of the packet relay processing in the router and the voice packet transmission processing on the PBX side increases, and it is necessary to match either of the allowable values.
[0008]
Second, when transmitting the tone or announcement sound source in the PBX to the LAN telephone, if the communication between the PBX itself and the PBX is stopped or becomes abnormal, the voice announcement cannot be connected to the LAN telephone. It is. The reason is that since the sound source is in the PBX, when communication with the PBX itself and the PBX is stopped or becomes abnormal, there is no other means for connecting.
[0009]
Thirdly, in the method described in the above-mentioned first publication, when the tone is changed or the voice is changed to a sound other than the tone, it is necessary to stop the PBX or the telephone or change the related processing. The reason is that to change the tone, it is necessary to change the PCM coded data of the telephone, and to change to radio music that flows in real time other than the fixed tone, the processing on the PBX side or the telephone side Is stopped and the process needs to be changed.
[0010]
Fourth, in the method disclosed in the above-mentioned second publication, the load on the voice relay and multiplexing device increases as the scale of the LAN network to be connected and the number of voice relay and multiplexing devices increase. The reason is that as the number of voice relay and multiplexing devices increases on the network, the probability that the receiving side voice relay and multiplexing device receives packets irrelevant to itself increases, and the load due to the analysis of the received packets increases. It is to increase.
[0011]
[Object of the invention]
SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems of the related art, and has as its object to provide a LAN telephone system that can connect voices such as tones and announcements without imposing a load on a network. Another object of the present invention is to provide a LAN telephone system which enables connection of an emergency announcement to a LAN telephone even when the PBX is stopped.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, the LAN telephone system of the present invention employs the following characteristic configuration.
[0013]
(1) In a LAN telephone system having a plurality of LAN telephones installed on the same LAN (local area network) and a PBX (private branch exchange) controlling the LAN telephones,
The LAN telephone, which is instructed by the PBX to connect a tone or an announcement such as a dial tone / ringing tone / busy tone / hold tone, reproduces a voice from a tone / announcement voice packet provided from a voice server. system.
[0014]
(2) The voice server is installed in the same segment as the LAN telephone (a range where a broadcast packet reaches), and stores storage means for storing voice packets of tones and announcements indicated by the PBX; The LAN telephone system according to the above (1), further comprising: a transmitting unit that transmits the data to the LAN.
[0015]
(3) The LAN telephone includes: means for transmitting a transmission request packet of a voice packet to the voice server; means for receiving a voice packet from the voice server; and means for reproducing voice from the voice packet. The LAN telephone system according to the above (1) or (2).
[0016]
(4) The LAN telephone, when instructed to cut off the tone or the announcement from the PBX, means for stopping reproduction of the voice packet transmitted from the voice server, and discards the voice packet from the voice server. The LAN telephone system according to the above (1), (2) or (3), comprising:
[0017]
(5) When the voice server receives a transmission request packet of a tone or announcement voice packet from the LAN telephone, the voice server transmits a voice packet for a predetermined period of time, and transmits a voice packet transmission request during transmission of the voice packet. The LAN telephone system according to any one of the above (1) to (4), wherein, when received, the transmission of the voice packet is extended for a predetermined time.
[0018]
(6) The transmission request packet of the tone or announcement voice packet transmitted from the LAN telephone to the voice server and the voice packet transmitted from the voice server are both transmitted as broadcast packets. The LAN telephone system according to any one of the above.
[0019]
(7) The LAN telephone that has transmitted a tone or announcement voice packet transmission request packet to the voice server, monitors the voice packet transmission request packet from another LAN telephone for a predetermined period of time, If it is desired to extend the reception of the voice packet after monitoring for a certain period of time, and if the transmission request packet of the same voice packet as the one requested for transmission cannot be found during the monitoring, the transmission request packet of the voice packet is transmitted from itself again. The LAN telephone system according to any one of (1) to (6), wherein, if found, the voice packet is continuously received without transmitting the voice packet transmission request packet.
[0020]
(8) The LAN telephone has storage means for storing the type of tone or announcement instructed from the PBX, storage means for storing the result of monitoring a transmission request packet of a voice packet from another LAN telephone, and monitoring. The LAN telephone system according to any one of (1) to (7), further comprising: a storage unit for storing time.
[0021]
(9) The voice server holds a transmission state for each voice type of tone or announcement, a means for storing that a transmission request packet has been received during transmission of a voice packet for each voice type, The LAN telephone system according to any one of the above (1) to (8), further comprising: storage means for storing a time for transmitting a voice packet for each type.
[0022]
(10) The LAN telephone detects the stop or abnormality of the communication with the PBX itself or the PBX, and detects the stop or abnormality of the communication with the PBX itself or the PBX and the handset goes off-hook. The LAN telephone system according to any one of (1) to (9), wherein a transmission request packet of an emergency announcement voice packet is transmitted to the voice server, and the voice packet from the voice server is reproduced.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the configuration and operation of a preferred embodiment of a LAN telephone system according to the present invention will be described in detail with reference to the accompanying drawings.
[0024]
FIG. 1 is a network configuration diagram or a system configuration diagram of a preferred embodiment of a LAN telephone system according to the present invention. The LAN telephone system (or network) 10 includes a PBX 100 connected to a LAN, a plurality of voice servers 101, 120, 130, and a plurality of extensions 102, 103, 104, 121, 122, 123, 131, which are LAN telephones. 132, 133, a plurality of routers 110, 111, 112, a plurality of gateways (GW) 113, 114, and the Internet 115. Here, the extensions 102 to 104, 121 to 123 and 131 to 133 are distributed on the network, and the voice servers 101, 120 and 130 are arranged for each segment where these extensions are arranged. That is, the voice server 101 is provided for the extensions 102 to 104, the voice server 120 is provided for the extensions 121 to 123, and the voice server 130 is provided for the extension servers 131 to 133.
[0025]
Next, FIG. 2 is a block diagram showing an internal configuration of the PBX 100 in the LAN telephone system 10 shown in FIG. The PBX 100 includes a CPU (central processing unit) 301, a memory 302, and a LAN interface 303. Here, the CPU 301 controls the call state of the LAN telephone 10 by program control. The memory 302 stores a program used by the CPU 301 and the like. The LAN interface 303 communicates a call control message with the LAN telephone 102 or the like as an extension.
[0026]
Next, FIG. 3 is a block diagram showing the internal configuration of the LAN telephone (or extension) 102 used in the LAN telephone system shown in FIG. The other LAN telephones 103 to 104, 121 to 123, 131 to 133 have substantially the same configuration. The LAN telephone 102 includes a CPU 311, a memory 312, a LAN interface 313, a voice control circuit 314, a speaker 315, and a microphone 316.
[0027]
Here, the LAN interface 313 receives a call control command from the PBX 100 and relays transmission and reception of voice packets. The CPU 311 controls each unit in the LAN telephone 102. The memory 312 stores a control program used by the CPU 311 and the like. The voice control circuit 314 connects the microphone 316 and the speaker 315, and generates a voice packet from voice or reproduces voice from voice packet.
[0028]
Next, FIG. 4 is a block diagram showing an internal configuration of the voice server (for example, the voice server 101) in FIG. The audio server 101 includes a CPU 320, a memory 321, a LAN interface 322, an audio control circuit 323, and an external audio interface 324. A plurality of external sound sources, that is, a first external sound source 325 and a second external sound source 326 are connected to the external audio interface 324. The voice control circuit 323 takes in voice through the external voice interface 324 via the external sound sources 325 and 326, and converts the voice into a voice packet. The memory 321 temporarily stores the converted voice packet, and transmits the voice packet to the LAN telephone via the LAN interface 322 in response to a request from the LAN telephone 102 or the like. The CPU 320 is a control device that operates under program control, and controls each unit inside the voice server 101.
[0029]
Next, specific examples of various management tables will be described with reference to FIGS. FIG. 5A shows a “voice packet reception management table” of tones and announcements stored in the LAN telephone 102 or the like. In the “voice packet reception management table”, the “PBX IP address” that stores the IP address of the PBX 100 that controls the LAN telephone 102, and the tone or announcement type that the LAN telephone 102 or the like instructs from the PBX 100 is stored. "Speech type", "transmission request packet" to store that a transmission request packet of a voice packet from another LAN telephone is found, "monitoring timer" to store monitoring time, and number of retransmissions when there is no response from PBX The number of retransmissions to the PBX. The initial value of the “monitoring timer” is set in advance to a value sufficiently smaller than the voice packet transmission timer of the voice server 101 so that the tone and the announcement are transmitted without interruption.
[0030]
FIG. 5B shows a “voice packet transmission management table” of tones and announcements stored in the voice server 101. The "voice packet transmission management table" includes a "voice type", a "status" indicating a transmission state for each voice type, and a "transmission request packet" for storing that a transmission request packet was received during transmission of a voice packet. And a "transmission timer" for storing a time for transmitting the voice packet.
[0031]
FIG. 5C shows an “extension state management table” of the LAN telephone 102 and the like used by the PBX 100. This extension state management table is composed of “IP address” information necessary for LAN communication for each extension and information for managing a call state such as “extension state” or a call partner.
[0032]
The LAN telephone system 10 shown in FIG. 1 switches the PBX 100 from the “initial state” to the “usable state” by notifying the PBX 100 of the start-up and tone and announcement “voice packet reception management table” (FIG. 5A )) Must be initialized.
[0033]
Next, FIG. 6 shows an “extension initial setting sequence” from when the power of the extension 102 which is a LAN telephone is turned on until the extension becomes available. An initialization sequence of the LAN telephone 102 will be described with reference to FIG. When the LAN telephone 102 is reset, the PBX 100 is initialized by setting the IP address of the PBX 100 previously stored in the “voice packet reception management table” (see FIG. 5A) of the LAN telephone (extension) 102. "Setting request" is transmitted (step 400). In response to this initialization request, the PBX 100 notifies the LAN telephone 102 of the connection information of the voice server 101 as information necessary to make the LAN telephone 102 usable (step 401). The LAN telephone 102 that has received the connection information of the voice server 101 performs an initialization process based on the information notified from the PBX 100 and, at the same time, initializes the “voice packet reception management table”. When the initialization is completed, an initialization completion notification is transmitted to the PBX 100 (step 402). The PBX 100 that has received the initial setting completion notification sets the “extension state management table” (see FIG. 5C) to “empty state” and sets the extension 102 to “usable state”.
[0034]
Next, the "processing from off-hook to extension call" in which the LAN telephone 102 actually receives a tone or announcement voice packet from the voice server will be described with reference to the sequence diagram of FIG. The extensions 102 and 103, which are LAN telephones, have already been initialized and are ready for use, and the "voice packet reception management table" of each extension is in the state shown in FIG. In this state, when the extension 102 goes off-hook, the extension 102 transmits a call control packet notifying the PBX 100 of the off-hook (step 410). When recognizing that the extension 102 has gone off-hook, the PBX 100 transmits a call control packet for a dial tone connection instruction to the extension 102 (step 411). At the same time, the state of the extension 102 in the “extension state management table” (see FIG. 5C) in the memory 302 in the PBX 100 is changed to “transmission of dial tone”.
[0035]
The extension 102 that has received the call control packet for the dial tone connection instruction as described above transmits a dial tone transmission request to the voice server at the same time as transmitting a broadcast packet to the voice server, and simultaneously sets the voice type to the voice type in the “voice packet reception management table” of the extension 102. The sound and the transmission request packet are set to "none", and the monitoring timer is set to a predetermined initial value to start subtraction (step 412). The voice server 101 that has received the dial tone transmission request from the extension 102 immediately transmits the dial tone voice packet as a broadcast packet, and simultaneously transmits the dial tone voice packet in the “voice packet transmission management table” (see FIG. 5B). The state is set to “transmission”, the transmission request packet is set to “none”, and the transmission timer is set to a predetermined initial value, and subtraction is started. The extension 102 receiving the voice packet of the dial tone from the voice server 101 converts the voice packet into an analog signal and transmits the dial tone from the receiver.
[0036]
Next, when the extension 102 decrements the reception timer to “0”, the transmission request packet in the “voice packet reception management table” is confirmed. In the case of "none", the "sending tone transmission request" is retransmitted to the voice server 101 (step 413), and at the same time, the initial value is reset in the reception timer and the subtraction is started. This is continued until the state of the extension 102 changes.
[0037]
Next, when the extension 102 that is transmitting a dial tone dials, the extension 102 stops receiving voice packets, sets the voice type in its own voice packet reception management table to "none", and simultaneously calls the dialed information. The PBX 100 is notified with a control packet (step 414). The PBX 100 analyzes the dial number sent from the extension 102 and, when judging that the extension to be called is the extension 103, transmits a ringing transmission instruction with a call control packet to the extension 103, and the extension in the “extension state management table”. The state of 103 is changed to "ringing transmission" (step 415). The call control packet is instructed to the extension 102 to transmit a ringing tone, and the state of the extension 102 in the “extension state management table” is changed to “ringing tone connection instruction” (or ringing tone transmission) (step 416). . The extension 102 that has received the “ringing tone connection instruction” from the PBX 100 transmits a “ringing tone transmission request” to the voice server 101 and, at the same time, sends “ringing tone” as the voice type in its “voice packet reception management table”. The request packet is set to "none" and the monitoring timer is set to an "initial value" defined in advance, and subtraction is started (step 417).
[0038]
The voice server 101 that has received the “ringing sound transmission request” from the extension 102 immediately transmits the ringing sound voice packet, and simultaneously sets “ringing” in the “ringing sound state” of the “voice packet transmission management table” and “send” to the transmission request packet. “None” and “initial value” defined in advance in the transmission timer are set. The extension 102 that has received the ringing voice packet from the voice server 101 converts the voice packet into an analog signal, and transmits the ringing tone from the receiver. The extension 103 that has received the ringing transmission instruction from the PBX 100 performs ringing transmission (or a ringing sound transmission request) according to predetermined control.
[0039]
Next, when the extension 102 decrements the reception timer to “0”, the transmission request packet in the “voice packet reception management table” is confirmed. In the case of "none", the "sound transmission request" is retransmitted to the voice server 101 (step 418), and at the same time, the initial value is reset in the reception timer and the subtraction is started. This is continued until the state of the extension 102 changes.
[0040]
Next, when the extension 103 responds, the PBX 100 is notified of the response of the extension 103 by a call control packet (step 419). The PBX 100 that recognizes the response of the extension 103 notifies the extension 102 and the extension 103 of a connection instruction by a call control packet. At the same time, the extensions 102 and 103 are changed to "call" in the extension state memory. The extension 102 that has received the connection instruction from the PBX 100 stops the ringing tone that has been received so far (step 421), and enters a state of talking with the extension 103 (step 422). Also, the extension 103 stops transmitting ringing (step 420), and enters a state of talking with the extension 102 (step 422).
[0041]
Next, with reference to the flow chart of FIG. 9, a description will be given of an example of the operation after the execution of the ringing tone transmission request (step 417) of FIG. In the "voice packet reception management table" of the LAN telephone 102 immediately after transmitting the ringing tone transmission request, "ringing tone" for the voice type, "none" for the transmission request packet, and "initial value" defined in advance for the monitoring timer Is entered, and the voice packet of the ringing tone from the voice server 101 is being transmitted.
[0042]
In this state, when a periodic program for decrementing the reception timer value starts, it is first determined whether or not the transmission type in the "voice packet reception management table" is "none" (step 500). If the sound type is "none", the program is terminated. Otherwise, the reception timer is decremented (step 501). Next, the reception timer is compared with "0" (step 502). If it is not "0", the program is terminated, and if it is "0", a transmission request packet is determined (step 503). If the result of the determination is "none", a ringing tone transmission request packet is immediately transmitted to the voice server 101 (step 504). The transmission request packet is set to "none" (step 505), and is changed to an "initial value" defined in advance by the reception timer (step 506). On the other hand, if the transmission request packet is "present", the transmission request packet is set to "none" (step 505), and the "initial value" defined in advance is written in the reception timer value, and the process ends (step 506).
[0043]
Next, with reference to the flowchart of FIG. 10, an example of the operation of the voice server 101 after the transmission of the ringing tone transmission request (step 417) of FIG. Immediately after receiving the ringing tone transmission request (step 417), the voice server 101 sets “ringing” in the ringing tone state of the “voice packet transmission management table”, “none” in the transmission request packet, and “predefined in the transmission timer”. "Initial value" is entered, and a voice packet of a ringing tone from the voice server 101 is being transmitted. In this state, a periodic program for decrementing the ringing tone transmission timer is activated. First, the state of the ringing tone in the "voice packet transmission table" is determined (step 510). If the state is "stop", the program ends. On the other hand, if the status is "transmission", the transmission timer is decremented (step 511).
[0044]
Next, the transmission timer is compared with "0" (step 512). If not "0", the program ends. On the other hand, if it is “0”, the reception of the transmission request packet is determined (step 513). If the result of the determination is "present", the transmission of the ringing tone voice packet is continued, and "none" (step 514) is set in the transmission request packet and "initial value" defined in advance in the transmission timer is reset. (Step 515). If the transmission request packet is "none", transmission of the ringing sound voice packet is stopped (step 516). At the same time, the state is changed to "stop" (step 517).
[0045]
Next, the “emergency announcement sending operation” when the PBX 100 is stopped will be described with reference to the sequence diagram of FIG. When the extension 102, which is a LAN telephone, goes off-hook, the extension 102 sends a call control packet notifying the PBX 100 of the off-hook (step 430). However, since there is no response from the PBX 100 (step 431), the retransmission of the call control packet is repeated for a predetermined number of retransmissions (see FIG. 5A) for the LAN telephone 102 or a predetermined time (see FIG. 5A). Step 432).
[0046]
If there is no response from the PBX 100 even if the number exceeds the specified value, an emergency announcement transmission request is transmitted from the extension 102 to the voice server 101 by a broadcast packet (step 434). At the same time, "emergency announcement" is set as the voice type in the "voice packet reception management table" of the user, "none" is set in the transmission request packet, and "initial value" defined in advance in the monitoring timer, and the subtraction is started. Upon receiving the emergency announcement transmission request from the extension 102, the voice server 101 immediately transmits the emergency announcement voice packet as a broadcast packet, and simultaneously sets the status of the emergency announcement in the "voice packet transmission management table" to "transmission", and transmits the voice request. The packet is set to "none" and the transmission timer is set to an "initial value" defined in advance, and subtraction is started. The extension 102, which has received the voice packet of the emergency announcement from the voice server 101, converts the voice packet 101 into an analog signal and transmits an "emergency announcement" from the receiver.
[0047]
Next, when the extension 102 decrements the reception timer to “0”, the transmission request packet in the “voice packet reception management table” is confirmed. In the case of “none”, the “urgent announcement voice packet transmission request” is transmitted to the voice server 101 again. At the same time, “none” is set in the voice request packet and “initial value” defined in advance by the monitoring timer is reset, and the subtraction is started. This is continued until the extension 102 goes on-hook (step 435).
[0048]
Next, another (or second) embodiment of the LAN telephone system according to the present invention will be described. FIG. 11 shows a network configuration diagram of the LAN telephone system 20 of the second embodiment. The LAN telephone system 20 includes a PBX 600, a voice server 601, a plurality of extensions (LAN telephones) 602 to 604, a plurality of routers 610 to 612, and a gateway (GW) 621.
[0049]
That is, the LAN telephone system 20 shown in FIG. 11 includes one PBX 600, extensions 602 to 604 as a plurality of LAN telephones, and one voice server 601. The extensions 602 to 604 are distributed on the network, and only one voice server 601 is arranged on the network. In the system configuration as shown in FIG. 11, a voice packet transmission request for a tone or an announcement from the extensions 602 to 604 or a voice packet from the voice server 601 transmits and receives data by IP multicast. IP multicast is a protocol capable of broadcasting over routers 610 to 612, and can broadcast voice packets and voice packet transmission requests, similarly to the LAN telephone system 10 of the first embodiment shown in FIG. It becomes possible.
[0050]
In another embodiment, a virtual LAN using a virtual LAN can be constructed. When a virtual LAN is constructed, it is possible to make it appear that the extensions or voice servers of physically separated segments are logically present in the same segment. In this case, a voice packet transmission request from an extension or a voice packet from a voice server can be transmitted and received as a broadcast packet.
[0051]
The configuration and operation of the preferred embodiment of the LAN telephone system according to the present invention have been described above in detail. However, it should be noted that such embodiments are merely examples of the present invention and do not limit the present invention in any way. It will be readily apparent to those skilled in the art that various modifications and changes can be made in accordance with the particular application without departing from the spirit of the invention.
[0052]
【The invention's effect】
As can be understood from the above description, the LAN telephone system of the present invention has the following practically significant effects. First, there is no load on LAN traffic. The reason is that the voice server is arranged in the same segment as the LAN telephone, so that one broadcast packet can be received by a plurality of LAN telephones, and the broadcast packet may pass through a router. This is because it is not possible to affect the main LAN.
[0053]
Second, the voice announcement can be connected to the LAN telephone even when the PBX itself or the communication with the PBX is stopped or an abnormality occurs and the telephone cannot be controlled. The reason is that the voice server is independent of the PBX, so it is not affected by the stop of the PBX, etc., and the LAN telephone and the voice server are located in the same segment, so they are affected by LAN failures occurring outside the segment. This is because the communication between the LAN telephone and the voice server uses broadcast packets, so that packets can be transmitted and received without knowing the IP address.
[0054]
Third, it is possible to have different tones and announcements for each segment where a LAN telephone is located. The reason is that the range affected by changing the value of the voice server is the LAN telephone in the segment where the voice server is located. Therefore, by changing the voice packet of the voice server, it is possible to change the tone or announcement of each segment. This is because it can be changed.
[0055]
Fourth, tones and announcements can be changed without stopping the PBX or LAN telephone. The reason is that since the voice operates independently of the PBX or LAN telephone, there is no need to stop the PBX or LAN telephone when changing the voice.
[Brief description of the drawings]
FIG. 1 is a network configuration diagram of a first embodiment of a LAN telephone system according to the present invention.
FIG. 2 is a block diagram showing a configuration of a PBX in the LAN telephone system shown in FIG.
FIG. 3 is a block diagram showing a configuration of a LAN telephone in the LAN telephone system shown in FIG. 1;
FIG. 4 is a block diagram showing a configuration of a voice server in the LAN telephone system shown in FIG. 1;
5A and 5B show specific examples of a management table used in the LAN telephone system shown in FIG. 1, wherein FIG. 5A shows a voice packet reception management table, FIG. 5B shows a voice packet transmission management table of a voice server, and FIG. It is an extension state management table of PBX.
FIG. 6 is a sequence diagram of an extension initial setting in the LAN telephone system shown in FIG. 1;
FIG. 7 is a sequence diagram from an off-hook to an extension call in the LAN telephone system shown in FIG. 1;
FIG. 8 is a sequence diagram when the PBX in the LAN telephone system shown in FIG. 1 is stopped.
FIG. 9 is a flowchart of a LAN telephone program in the LAN telephone system shown in FIG. 1;
FIG. 10 is a flowchart of a voice server program in the LAN telephone system shown in FIG. 1;
FIG. 11 is a network configuration diagram showing a configuration of a second embodiment of the LAN telephone system according to the present invention.
FIG. 12 is a block diagram showing a configuration of a conventional PBX.
FIG. 13 is a block diagram showing a configuration of a conventional audible signal sound transmission system.
[Explanation of symbols]
10, 20 LAN telephone system
100 PBX
101, 120, 130, 601 Voice server
102, 103, 104, 121, 122, 123, 131, 132, 133 extension (LAN telephone)
110, 111, 112, 610, 611, 612 Router
113, 114, 621 Gateway (GW)
201, 301, 311, 320 CPU (Central Processing Unit: Processor)
302, 321, 312 memory
303, 313, 322 LAN interface
314, 323 Voice control circuit
324 External voice interface
325, 326 External sound source

Claims (10)

In a LAN telephone system having a plurality of LAN telephones installed on the same LAN (local area network) and a PBX (private branch exchange) for controlling the LAN telephones,
The LAN telephone, which is instructed by the PBX to connect a tone or an announcement such as a dial tone / ring tone / busy tone / hold tone, reproduces voice from a tone / announce voice packet provided from a voice server. Characteristic LAN telephone system. The voice server is installed in the same segment as the LAN telephone (a range where the broadcast packet reaches), and stores storage means for storing voice packets of tones and announcements indicated by the PBX, and transmits the voice packets to the LAN. 2. The LAN telephone system according to claim 1, further comprising a transmission unit that performs the transmission. The LAN telephone comprises: means for transmitting a transmission request packet of a voice packet to the voice server; means for receiving a voice packet from the voice server; and means for reproducing voice from the voice packet. The LAN telephone system according to claim 1 or 2, wherein: The LAN telephone, when instructed by the PBX to disconnect a tone or an announcement, means for stopping reproduction of a voice packet transmitted from the voice server, and means for discarding a voice packet from the voice server. The LAN telephone system according to claim 1, wherein the LAN telephone system is provided. When the voice server receives a transmission request packet of a tone or announcement voice packet from the LAN telephone, it transmits a voice packet for a predetermined period of time, and receives a voice packet transmission request during transmission of the voice packet. 5. The LAN telephone system according to claim 1, wherein the transmission of the voice packet is extended for a predetermined time. 6. A voice packet transmitted from the voice server and a transmission request packet of a voice packet of a tone or an announcement transmitted from the LAN telephone to the voice server are both transmitted as broadcast packets. The LAN telephone system described in Crab. The LAN telephone that has transmitted a transmission request packet of a tone or an announcement voice packet to the voice server is configured to monitor a transmission request packet of a voice packet from another LAN telephone for a predetermined period of time; If you want to extend the reception of the voice packet later, if you cannot find the transmission request packet of the same voice packet that you requested to send during monitoring, if you can send the transmission request packet of the voice packet again from yourself, 7. The LAN telephone system according to claim 1, wherein the voice packet is continuously received without transmitting the voice packet transmission request packet. The LAN telephone has a storage unit for storing the type of tone or announcement specified by the PBX, a storage unit for storing a result of monitoring a transmission request packet of a voice packet from another LAN telephone, and a monitoring time. The LAN telephone system according to any one of claims 1 to 7, further comprising a storage unit that performs the operation. The voice server is configured to hold a transmission state for each voice type of a tone or an announcement, for storing the reception of a transmission request packet during transmission of a voice packet for each voice type, and for each voice type. The LAN telephone system according to any one of claims 1 to 8, further comprising storage means for storing a time for transmitting the voice packet. The LAN telephone is configured to detect a stop or anomaly of communication with the PBX itself or the PBX. 10. The LAN telephone system according to claim 1, wherein a transmission request packet of a voice packet for emergency announcement is transmitted to a voice server, and the voice packet from the voice server is reproduced.

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