JP2011003963A - Ip telephone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a temporarily silent state when starting a telephone call of an IP telephone.SOLUTION: After the IP telephone 100 transmits an origination message (S2), the IP telephone 100 rings an RBT (S4). Even after connection with a destination is completed and an RTP open message (S8a) indicative of a telephone call start instruction is received, the IP telephone continues to ring the RBT. When an RTP packet is received from the destination (S11a), the ringing of the RBT is stopped. Thereby, the IP telephone avoids a silent state ay the time of telephone call start, in order not to give displeasure to calling parties.

Description

  The present invention relates to an IP telephone that transmits and receives IP packets to and from an IP network.

  Since IP telephones are affected by failures in the IP network and fluctuations in the IP network, various methods are employed in order to avoid these effects.

  By the way, in general, in an IP telephone, for example, as described in Patent Document 1 below, when an outgoing message or a connection request is transmitted, a ringing tone RBT (Ringing Back Tone) is output from the speaker of the handset. When an RTP (Real-time Transport Protocol) open message or a connection completion notification is received, the output of RTP is stopped.

Japanese Patent Laying-Open No. 2005-045577 FIG.

  As in the technique described in Patent Document 1, generally, the originating IP telephone stops the output of the RBT upon receiving an RTP open message or a connection completion notification. At this time, in this prior art, when a temporary failure occurs in the IP network or when an IP voice packet is delayed on the IP network, the calling party on the caller side recognizes that the RBT is stopped and a call can be made. Nevertheless, a temporary silence may occur. Also, in this prior art, when a ringing tone is generated from the IP phone on the receiving side and the person on the receiving side removes the handset, if there is a temporary failure in the IP network, There is a case where a so-called head break occurs in which the first person's voice cannot be heard.

  In other words, this prior art has a problem in that a silent state is temporarily set at the start of a call, which may cause discomfort to the caller.

  An object of the present invention is to provide an IP telephone that avoids a silent state at the start of a call and does not cause discomfort to the caller by paying attention to such problems of the prior art.

An invention relating to an IP telephone for solving the above problems is as follows:
Signal sound generation processing means for outputting a ringing tone RBT (Ringing Back Tone) to the handset speaker, and analyzing and analyzing the IP packet received by the communication unit, and converting the data transmitted from the communication unit into an IP packet Communication processing means for performing call control, and call control means for executing call control,
The call control means includes
An outgoing message is created in response to the request, the outgoing message is converted into an IP packet by the communication processing means, and an IP packet including the outgoing message is transmitted from the communication unit. Let the handset speaker output the RBT,
After the communication processing means recognizes that the IP packet received by the communication unit is an RTP (Real-time Transport Protocol) open message indicating the start of a call with the destination indicated by the outgoing message, the communication unit When the received IP packet is recognized as including the RTP packet from the destination, the signal sound generation processing means stops the output of the RBT from the handset speaker.
It is characterized by that.

In addition, another invention relating to an IP phone for solving the above problems is as follows:
A signal sound generation process for causing the handset speaker to output a ringing tone RBT (Ringing Back Tone), causing the external speaker to output a ringtone, and outputting a voice waiting sound indicating voice waiting to the handset speaker and / or the external speaker. Means, a communication processing unit for decomposing and analyzing the IP packet received by the communication unit, converting the data transmitted from the communication unit into an IP packet, and a call control unit for executing call control,
The call control means includes
When the communication processing unit recognizes that the IP packet received by the communication unit is an incoming message, the signal sound generation processing unit causes the external sound to be output from the external speaker and the incoming call from the external speaker. The IP packet received by the communication unit includes the RTP packet from the source indicated by the incoming message by the communication processing unit after the handset is detected to be off-hook in the process of outputting sound. Until it is recognized, the signal sound generation processing means causes the handset speaker and / or the external speaker to output a sound waiting sound,
An IP telephone characterized by the above.

  In the present invention, since the stop timing of the RBT or ringtone is set when the RTP packet arrives from the other party, even if a network failure occurs at the start of the call and a communication packet delay occurs, Temporary silence can be avoided.

1 is a configuration diagram of an IP telephone and a communication system including the same according to an embodiment of the present invention. It is explanatory drawing which shows the data structure of the statistical information table in one Embodiment which concerns on this invention. It is a sequence diagram (the 1) which shows operation | movement of the communication system at the time of the transmission of the IP telephone in one Embodiment which concerns on this invention. It is a sequence diagram (the 2) which shows operation | movement of the communication system at the time of the transmission of the IP telephone in one Embodiment which concerns on this invention. It is a sequence diagram which shows operation | movement of the communication system at the time of the incoming call of the IP telephone in one Embodiment concerning this invention.

  Embodiments of an IP telephone according to the present invention will be described below with reference to the drawings.

  First, before describing the IP telephone according to the present embodiment, a communication system including the IP telephone will be described.

  The base A is provided with a plurality of IP telephones 100, an IP telephone exchange 191 and a hub 190 that connects the plurality of communication devices 100, 191, and 2a so that they can communicate with each other. The hub 190 at the site A is connected to the WAN 1 through the router 2a so as to be communicable.

  In addition, the base B is provided with a plurality of IP telephones 100b and a hub 190 that connects the plurality of communication devices 100b and 2b so that they can communicate with each other. The hub 190b at the site B is connected to the WAN 1 through the router 2b so as to be communicable.

  The IP telephone 100 provided at the site A described above is the IP telephone of this embodiment. On the other hand, the IP telephone 100b provided at the site B described above is the conventional IP telephone described in the background art section.

  The IP telephone 100 according to the present embodiment includes a processor 110 that executes various arithmetic processes, a read-only ROM 120, a RAM 130 that becomes a work area of the processor 110, a readable / writable nonvolatile flash ROM 140, a hub 190, and the like. A communication interface 150 that communicates with other communication devices, a handset 160 having a handset speaker 161 and a microphone, and a digital signal from the processor 110 is converted into an analog signal, while an analog signal from the handset 160 is converted into a digital signal. An A / D converter 162 that outputs a ring tone, an A / D converter 166 that converts a digital signal from the processor 110 into an analog signal, and sends the analog signal to the external speaker 165. Off hook sensor 169 for detecting the hook, and various input keys 170, and an input interface 171 is an interface for various input keys 170.

  The processor 110 functionally decomposes and analyzes the IP packet received by the communication interface 150, converts the data transmitted from the communication interface 150 into an IP packet, and a call control unit that executes call control. 112, a voice control unit 113 that performs voice control, a signal sound generation processing unit 114 that outputs various signal sounds from the handset speaker 161 and the external speaker 165, and a voice wait until an RTP packet from the destination is received. A statistical processing unit 115 that measures time and statistically processes the voice waiting time.

  The ROM 120 stores programs executed by the processor 110, various signal sounds, and the like in advance. The functional units 111 to 115 of the processor 110 function when the processor 110 executes a program stored in the ROM 120.

  The flash ROM 140 is provided with a configuration information table that stores configuration information of various communication devices including its own IP telephone, and a statistical information table 141 that stores statistical values calculated by the statistical processing unit 115.

  Next, the operation of the communication system described above will be described according to the sequence diagrams shown in FIGS.

  First, according to the sequence diagrams shown in FIGS. 3 and 4, the operation of the communication system at the time of outgoing call from the IP telephone 100 of the present embodiment provided at the base A to the IP telephone 100b provided at the base B will be described. .

  When the destination number is input to the IP phone 100 at the site A and the call control unit 112 of the IP phone 100 accepts the destination number (S1), the call control unit 112 creates an outgoing message including the destination number and performs communication. The data is passed to the processing unit 112. The communication control unit 112 converts this outgoing message into an IP packet and sends this outgoing message from the communication interface 150 (S2).

  When the communication control unit 112 sends out the outgoing message, the call control unit 112 of the IP telephone 100 instructs the signal sound generation processing unit 114 to output a ringing tone RBT (Ringing Back Tone). Upon receiving this instruction, the signal sound generation processing unit 114 extracts RBT data from the signal sound data stored in the ROM 120, and outputs the sound indicated by this data from the handset speaker 161 (S4). .

  An outgoing message from the IP telephone 100 is received by the IP telephone exchange 191. The IP telephone exchange 191 creates an incoming message for the destination based on the outgoing message and transmits it to the IP telephone 100b at the base B (S3).

  When receiving the incoming message (S3b), the IP telephone 100b at the site B sounds a ringtone (S5). When a person at site B notices this ringtone and removes the handset of IP telephone 100b, that is, when IP telephone 100b goes off-hook (S6), IP telephone 100b stops the ringtone, An incoming call response message is sent to the IP telephone exchange 191 (S7).

  Upon receiving this incoming response message, the IP telephone exchange 191 notifies the IP telephone 100 at the base A and the IP telephone 100b at the base B that the connection processing is completed and the RTP (Real -time Transport Protocol) An open message is transmitted (S8a, S8b).

  When the call control unit 112 of the IP phone 100 at the site A and the call control unit of the IP phone 100b at the site B accept the RTP open message, the voice control unit is operated. From this point of time, the voice control unit 113 of the IP phone 100 at the site A and the voice control unit of the IP phone 100b at the site B acquire the sound collected by the handset microphone, put this in the RTP packet, and Is further stored in an IP packet and sent to the other party (S9, S11x). Note that immediately after receiving the RTP open message, the callers at both bases A and B do not immediately start speaking, so the voice data in the RTP packet immediately after receiving the RTP open message is basically silent data. is there.

  By the way, in the prior art described in the background art section, when the calling side receives the RTP open message, it stops ringing the RBT (S4x). At this time, if there is a failure in WAN 1 and there is a delay in the packets transmitted and received between both bases A and B, even if the calling party speaks, the RTP from the receiving side Since the packet does not reach, the calling party cannot temporarily hear the voice from the receiving side.

  However, since the IP telephone 100 according to the present embodiment continues to sound the RBT even when the RTP open message is received, at this time, the calling party does not basically speak. If you can't hear the voice from the called party, you won't feel anything wrong. As described above, the IP telephones 100 and 100b at both bases A and B transmit RTP packets from this point.

  When the communication processing unit 111 of the IP phone 100 at the site A disassembles the IP packet received by the communication interface 150, analyzes the IP packet, and recognizes that the IP packet includes the RTP packet from the incoming side. (S11a) The call control unit 112 of the IP telephone 100 causes the signal sound generation processing unit 114 to stop outputting the RBT. In other words, the IP telephone 100 according to the present embodiment rings the RBT from the time when the outgoing message is sent (S2) to the time when the RTP packet is received from the incoming side (S11a).

  When the ringing of the RBT stops, the calling party speaks, for example, “Hello”. The voice data is converted into RTP packets by the voice control unit 113, and further converted into IP packets by the communication processing unit 111, and transmitted to the incoming IP telephone 100b. On the other hand, IP packets including RTP packets are sequentially sent from the incoming IP telephone 100b, and received by the outgoing IP telephone 100. Therefore, in this embodiment, it is possible to avoid that the calling party cannot temporarily hear the voice from the receiving side at the start of the call.

  The statistical processing unit 115 of the IP telephone 100 on the outgoing side recognizes that the IP packet received by the communication interface 150 is an RTP open message by the communication processing unit 111 and then receives the IP packet received by the communication interface 150 from the incoming side. The time until the communication processing unit 111 recognizes that the RTP packet is included, that is, the voice waiting time from the reception of the RTP open message to the reception of the RTP packet from the incoming side is measured. When the RTP packet from the incoming side is received (11a), the statistical processing unit 115 statistically processes the voice waiting time and the voice waiting time measured in the past (S12).

  Here, the configuration of the statistical information table 141 provided in the flash ROM 140 will be described with reference to FIG.

  This statistical information table 141 includes a waiting time integrated value area 141a in which an accumulated value of voice waiting time for each base is stored, a number of times area 141b in which the number of times of measuring voice waiting time for each base is stored, and a voice waiting An average value area 141c for storing an average value (statistical value) for each base obtained from the accumulated value of time and the number of times of voice waiting time is stored, and a waiting time limit to be described later is determined based on this average value. And a coefficient area 141d in which a coefficient for each base is stored.

  When the statistical processing unit 115 measures the voice waiting time with the site B, the statistical processing unit 115 adds the voice waiting time to the integrated value stored in the waiting time integrated value area 141a of the site B in the statistical information table 141. In addition, 1 is added to the number of times stored in the number-of-times area 141b of the base B in the statistical information table 141. Then, the integrated value in the waiting time integrated value area 141a is divided by the number of times in the number of times area 141b to obtain the average value (statistical value) of the voice waiting time with the base B, and the base in the statistical information table 141 This average value is stored in the B average value area 141c. The above is the content of the statistical processing (S12) by the statistical processing unit 115.

  When the call control unit 112 of the IP telephone 100 at the site A recognizes that the communication processing unit 111 has received the RTP open message, the time from the reception of the RTP open message, in other words, the waiting time limit. It is monitored whether or not the time has been exceeded (S10). This waiting time limit time is a value obtained by multiplying the average value stored in the average value area 141c regarding the destination base B in the statistical information table 141 described above by the coefficient stored in the coefficient area 141d. At this time, the statistical information table 141 does not reflect the statistical processing result in step 12 described above, and reflects the statistical processing result before this time.

  If the communication processing unit 111 recognizes reception of the RTP packet from the destination before the waiting time limit is exceeded (S11a), the call control unit 112 stops the RBT ringing and performs statistical processing as described above. The unit 115 executes statistical processing (S12).

  On the other hand, before the communication processing unit 111 recognizes the reception of the RTP packet from the destination, if the waiting time limit time has elapsed and the call control unit 112 determines that the waiting time limit time has been exceeded (S10), FIG. As described above, the call control unit 112 causes the signal sound generation processing unit 114 to stop outputting the RBT, and instead outputs the BT (Busy Tone) from the handset speaker 161 to the signal sound generation processing unit 114 as the voice waiting excess sound. Let

  As a result, the calling party recognizes that the called party is busy and places the handset 160.

  Next, according to the sequence diagram shown in FIG. 5, the operation of the communication system at the time of outgoing call from the IP telephone 100b provided at the base B to the IP telephone 100 of the present embodiment provided at the base A, in other words, An operation of the communication system at the time of incoming call of the IP telephone according to the present embodiment will be described.

  When the call control unit of the IP phone 100b at the site B receives the destination number (S21), the call control unit creates an outgoing message including the destination number and transmits it from the communication interface (S22). Further, when the call control unit transmits the outgoing message, the call control unit outputs the RBT from the handset speaker (S24).

  The outgoing message from the IP telephone 100b at the site B is received by the IP telephone exchange 191. The IP telephone exchange 191 creates an incoming message for the destination based on the outgoing message, and transmits it to the IP telephone 100 at the site A (S23).

  When the communication interface 150 of the IP telephone 100 at the site A receives this incoming message and the communication processing unit 111 recognizes this as an incoming message (S23a), the call control unit 112 sends an external signal to the signal sound generation processing unit 114. A ring tone is output from the speaker 165 (S25).

  When a person at site A notices this ringing tone and removes the handset 160 of the IP telephone 100, in other words, when the off-hook sensor 169 detects an off-hook (S26), the call control unit 112 generates a signal sound. The processing unit 114 stops the ring tone and causes the telephone generation processing unit 114 to output a voice waiting sound from the handset speaker 161 (S30).

  Here, the voice waiting sound is output from the handset speaker 161, but may be output from the external speaker 165 or may be output from both speakers 161, 165. The voice waiting sound is preferably different from the ring tone, but may be the same as the ring tone. In this case, the ring tone continues even when the off-hook state (S26) is entered.

  Further, when the IP telephone 100 enters an off-hook state (S26), the call control unit 112 creates an incoming response message, which is converted into an IP packet by the communication processing unit 111, and then transmitted from the communication interface 150 (S27). ).

  When the IP telephone switch 191 receives this incoming response message, the RTP open message that informs the IP telephone 100 at the base A and the IP telephone 100b at the base B that the connection processing is completed and the telephone call may be started. (S28a, S28b).

  When the call control unit 112 of the IP phone 100 at the site A and the call control unit of the IP phone 100b at the site B accept the RTP open message, the voice control unit is operated. From this point of time, the voice control unit 113 of the IP phone 100 at the site A and the voice control unit of the IP phone 100b at the site B acquire the sound collected by the handset microphone, put this in the RTP packet, and Is further stored in an IP packet and sent to the other party (S29x, S31). Also in this case, as in the case of receiving the RTP open message described in FIG. 3, the voice data in the RTP packet is basically silent data. In addition, as described above, since the IP phone 100b at the site B is a conventional IP phone, when the RTP open message is received, the ringing of the RBT (S24) is stopped.

  Thereafter, the IP telephone 100 at the base B sends an IP packet including the RTP packet to the IP telephone 100 at the base A that is the destination (S29). When the IP telephone 100 at the base A receives the IP packet, When the communication processing unit 111 disassembles the IP packet, analyzes the IP packet, and recognizes that the IP packet includes the RTP packet from the calling side (S29a), the call control unit 112 of the IP telephone 100 performs Then, the signal sound generation processing unit 114 stops outputting the voice waiting sound. That is, the IP telephone 100 according to the present embodiment sounds a voice waiting sound after being off-hooked (S26) and before receiving an RTP packet from the calling side (S29a).

  By the way, in the prior art described in the background art section, when the receiving side enters the off-hook state, the ringing tone stops and no signal sound is output. At this time, if there is a failure in WAN 1 and there is a delay in the packets transmitted and received between both bases A and B, even if the calling party speaks, the RTP from the receiving side The packet does not reach and a so-called voice break occurs.

  However, even when the IP telephone 100 according to the present embodiment is in the off-hook state, the voice waiting sound is output until the RTP packet arrives from the incoming side, so that it is possible to avoid interruption of the voice.

  As described above, in this embodiment, since the stop timing of the signal sound is when the RTP packet arrives from the other side, even if a network failure occurs at the start of the call and a communication packet delay occurs, A temporary silent state at the start of a call can be avoided.

  100, 100b: IP telephone, 110: CPU, 111: communication processing unit, 112: call control unit, 113: voice control unit, 114: signal sound generation processing unit, 115: statistical processing unit, 141: statistical information table, 150 : Communication interface, 160: Handset, 161: Handset speaker, 165: External speaker, 170: Input key, 190: Hub, 191: IP exchange

Claims (5)

In an IP telephone having a communication unit that transmits and receives IP packets to and from an IP network,
A handset having a handset speaker for outputting audio to a caller;
Signal sound generation processing means for causing the handset speaker to output a ringing tone RBT (Ringing Back Tone);
A communication processing means for decomposing and analyzing the IP packet received by the communication unit, and converting the data transmitted from the communication unit into an IP packet;
Call control means for performing call control;
With
The call control means includes
An outgoing message is created in response to the request, the outgoing message is converted into an IP packet by the communication processing means, and an IP packet including the outgoing message is transmitted from the communication unit. Let the handset speaker output the RBT,
After the communication processing means recognizes that the IP packet received by the communication unit is an RTP (Real-time Transport Protocol) open message indicating the start of a call with the destination indicated by the outgoing message, the communication unit When the received IP packet is recognized as including the RTP packet from the destination, the signal sound generation processing means stops the output of the RBT from the handset speaker.
An IP telephone characterized by the above. The IP phone according to claim 2,
The communication processing unit recognizes that the IP packet received by the communication unit is the RTP open message and then recognizes that the IP packet received by the communication unit includes the RTP packet from the destination. A statistical processing means for statistically processing the voice waiting time and the past voice waiting time to obtain a statistical processing value of the voice waiting time each time the voice waiting time is measured. Prepared,
When the communication processing unit recognizes that the IP packet received by the communication unit is the RTP open message, the call control unit determines whether or not the waiting time limit determined according to the statistical processing value has been exceeded. If the waiting time limit is exceeded, the signal sound generation processing means stops the output of the RBT from the handset speaker.
An IP telephone characterized by the above. The IP phone according to claim 2,
The signal sound generation processing means causes the handset speaker to output an excessive sound waiting sound indicating an excessive sound waiting time,
The call control means causes the handset speaker to output the voice waiting excessive sound when the waiting time limit is exceeded.
An IP telephone characterized by the above. The IP telephone according to any one of claims 1 to 3,
It has an external speaker that outputs a ringtone,
The signal sound generation processing means causes the external speaker to output a ring tone, and causes the handset speaker and / or the external speaker to output a voice waiting sound indicating voice waiting,
The call control means includes
When the communication processing unit recognizes that the IP packet received by the communication unit is an incoming message, the signal sound generation processing unit causes the external speaker to output the ring tone,
In the process of outputting the ring tone from the external speaker, after the off-hook of the handset is detected, the communication processor receives the IP packet received by the communication unit from the source indicated by the incoming message. Until the signal sound generation processing means recognizes that it contains an RTP packet, a voice waiting sound is output from the handset speaker and / or the external speaker.
An IP telephone characterized by the above. In an IP telephone having a communication unit that transmits and receives IP packets to and from an IP network,
A handset having a handset speaker for outputting audio to a caller;
An external speaker that outputs a ringtone;
A signal that causes the handset speaker to output a ringing tone RBT (Ringing Back Tone), causes the external speaker to output a ringing tone, and causes the handset speaker and / or the external speaker to output a voice waiting sound indicating voice waiting Sound generation processing means;
A communication processing means for decomposing and analyzing the IP packet received by the communication unit, and converting the data transmitted from the communication unit into an IP packet;
Call control means for performing call control;
With
The call control means includes
When the communication processing unit recognizes that the IP packet received by the communication unit is an incoming message, the signal sound generation processing unit causes the external speaker to output the ring tone,
In the process of outputting the ring tone from the external speaker, after the off-hook of the handset is detected, the communication processor receives the IP packet received by the communication unit from the source indicated by the incoming message. Until the signal sound generation processing means recognizes that it contains an RTP packet, a voice waiting sound is output from the handset speaker and / or the external speaker.
An IP telephone characterized by the above.

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