JP4191183B2 - IP telephone system, packet conversion apparatus, and packet conversion method - Google Patents

Description

  The present invention relates to an IP telephone system, a packet conversion apparatus, and a packet conversion method using IP (Internet Protocol).

  A configuration of a conventional IP telephone system will be described.

  FIG. 10 is a block diagram showing a configuration example of a conventional IP telephone system.

  As shown in FIG. 10, the IP telephone system 100 includes an IP telephone terminal 110 and a SIP (Session Initiation Protocol) server 120 serving as an exchange for controlling calls. IP telephone terminal 110 and SIP server 120 are connected to network 130. Here, there are a plurality of IP telephone terminals 110, and the plurality of IP telephone terminals 110 are connected to the network 130 via the hub 140. In the following, it is assumed that one IP telephone terminal 110 is operated from among the plurality of IP telephone terminals, and the same applies to the other terminals, and the description thereof will be omitted. In the network 130, a plurality of routers not shown are connected. An IP telephone terminal 115 that is a communication destination of the IP telephone terminal 110 is connected to the network 130. The network 130 is generally the Internet, but may be a dedicated line network for IP telephones.

  The SIP server 120 serves as a proxy server that specifies the location of the party to call on behalf of the client and calls the party. The network 130 is provided with a location server, a redirect server, and a registration server not shown in the figure. The location server holds information of the source IP telephone terminal 110 and provides location information of the source IP telephone terminal 110 in response to a request from another server. When the address of the other party is changed, the redirect server notifies the new IP address to the IP telephone terminal 110 of the transmission source by inquiring the new address to the location server. The registration server performs new registration processing, update processing, deletion processing, and the like of the transmission source IP phone terminal 110 with respect to the location server in response to a request from the transmission source IP phone terminal 110.

  When IP phone terminal 110 requests call connection, IP phone terminal 110 transmits a connection request packet, which is a packet including its own identifier, the identifier of the other party, and information requesting connection, to SIP server 120. When the IP telephone terminal 110 receives the connection permission packet, which is a packet including the identifier of the own terminal, the identifier of the other party, and information indicating that the connection is permitted, from the IP telephone terminal 115 via the SIP server 120. It becomes possible to make a call with the IP telephone terminal 115. In this state, it becomes possible to transmit / receive RTP (Real-time Transport Protocol) packets including voice data to / from the IP telephone terminal 115 via the network 130. The RTP packet includes an identifier of a transmission source and an identifier of a transmission destination in addition to voice data. The identifier is a telephone number or an address on the network 130.

  In the IP telephone system shown in FIG. 10, the operation until IP telephone terminal 110 establishes a call with IP telephone terminal 115 will be briefly described.

  FIG. 11 is a flowchart showing an operation procedure until a call is established.

  When the operator operates the IP telephone terminal 110 and presses the telephone number of the other party, the IP telephone terminal 110 transmits a connection request packet to the SIP server 120 (step 201). When the SIP server 120 receives the connection request packet from the IP telephone terminal 110, the SIP server 120 specifies the location of the other party from the identifier of the other party in the connection request packet and transmits the connection request packet to the other party via the network 130. (Step 202). When receiving the connection request packet from the SIP server 120, the IP telephone terminal 115 as the other party rings a call bell. When the operator at the other end picks up the handset of IP telephone terminal 115, IP telephone terminal 115 transmits a connection permission packet including information indicating that the connection is permitted to SIP server 120 (step 203). When the SIP server 120 receives the connection permission packet from the IP telephone terminal 115, it transmits the connection permission packet to the IP telephone terminal 110 (step 204). When IP phone terminal 110 receives the connection permission packet, a call is established between IP phone terminal 110 and IP phone terminal 115. Thereafter, these terminals can talk by transmitting and receiving RTP packets to each other.

  On the other hand, conventional telephones that send audio data as analog signals use DTMF (Dial Tone Multi Frequency) data for systems on the telephone line network using the PB (Push Button) of the operation unit in addition to the purpose of calling. Can be sent. As a device using this DTMF, there is known a response device for registering a desired re-delivery date and time such as mail or courier. A method for registering the desired delivery date and time will be briefly described below.

  When the operator makes a call to the specified number and the telephone and the answering device are ready to communicate, the answering device transmits a voice message to the phone. The operator listens to the voice message through the handset and follows the guidance to press the push button on the telephone according to the desired date and time. The telephone transmits PB information, which is information corresponding to the push button, to the response device. The response device recognizes numbers and symbols from the PB information received from the telephone and stores them in the storage unit. In this way, information on the date and time desired by the operator is registered in the response device. The PB information includes symbols “*” and “#” in addition to the numbers “0” to “9”.

In addition, the conventional VoIP communication which performs a telephone call using an IP network is disclosed (refer patent document 1). This document discloses the use of a DTMF tone signal for notification of line switching.
JP 2004-165818 A

  The IP phone terminal was initially commercialized as a call device between IP phone terminals, and it was not assumed that the IP phone terminal was connected to a general telephone line network. Therefore, there are many models that are not compatible with the response device using the above-described DTMF.

  In addition, new RFC (Request For Comments) protocols are devised one after another, and new response devices are developed corresponding to the new protocols. Replacing an IP telephone terminal with a new model so as to be compatible with a new answering device not only increases the cost of communication facilities, but may be difficult depending on the operating status of the IP telephone system. Further, in the IP telephone system having a plurality of IP telephone terminals as in the conventional example described above, if all IP telephone terminals are replaced with new models, the cost burden becomes enormous.

  On the other hand, responding device manufacturers are reluctant to develop responding devices compatible with the new protocol because the existing IP telephone terminals cannot support the new protocol before the new protocol becomes widespread.

  The present invention has been made to solve the above-described problems of the prior art, and when the IP telephone terminal cannot transmit data in accordance with the specifications of the communication destination apparatus, It is an object of the present invention to provide an IP telephone system, a packet conversion apparatus, and a packet conversion method that complement a function and send an alternative packet.

In order to achieve the above object, the IP telephone system of the present invention provides:
PB information packet that is information including information corresponding to the push button of the operation unit and information on the identifier of the own terminal, and an RTP packet that is information including information on the identifier of the own terminal and the identifier of the partner An IP phone terminal to send to the outside,
A management table describing information on the identifier of the IP telephone terminal and the data format for sending the PB information is stored. When the PB information packet is received from the IP telephone terminal, the management table is referred to The data format is specified from the identifier of the IP telephone terminal included in the PB information packet, and an instruction to generate a packet for sending the PB information in the data format and a packet generation request signal including the PB information are externally transmitted. A server device to send to
The PB information is read from the packet generation request signal received from the server apparatus, the identifier of the destination and the identifier of the IP telephone terminal are read from the RTP packet received from the IP telephone terminal, and the PB according to the data format is read A packet conversion device that generates a packet including information, identifier of the destination and identifier of the IP telephone terminal, and transmits the packet to an address specified by the identifier of the destination via a network;
It is the structure which has.

  In the present invention, when transmitting the PB information by the push button of the operation unit of the IP telephone terminal to an external device via the network, the data format of the destination device is stored in the server device in advance, thereby converting the packet. The device sends out a packet corresponding to the data format. Therefore, even if the IP telephone terminal does not have a function of sending PB information according to the destination device, the destination device can recognize the PB information from the packet received via the packet conversion device. Become.

On the other hand, a packet conversion device of the present invention for achieving the above object is a packet conversion device connected to an IP telephone terminal and a server device,
A storage unit for storing information received from the IP telephone terminal and the server device;
An instruction to generate a packet for sending PB information indicating information corresponding to the push button of the operation unit of the IP telephone terminal in a predetermined data format and a packet generation request signal including the PB information are received from the server device. Then, the PB information is stored in the storage unit, and when the RTP packet, which is a packet including information on the identifier of the IP telephone terminal and the identifier of the other party, is received from the IP telephone terminal, the identifier of the IP telephone terminal and the Information on the identifier of the other party is stored in the storage unit, and a packet including information on the PB information in the predetermined data format, the identifier of the other party and the identifier of the IP telephone terminal is generated, and the identifier of the other party A control unit for transmitting via a network to the address specified in
It is the structure which has.

A packet conversion method of the present invention for achieving the above object is a packet conversion method by an IP telephone system having an IP telephone terminal, a server apparatus, and a packet conversion apparatus,
The server device receives the identifier of the IP telephone terminal and the identifier of the IP telephone terminal when the information of the data format for sending the PB information indicating the information corresponding to the push button of the operation unit is input from the outside. Register information on the data format for sending PB information in the management table of the storage unit,
When the push button is pressed, the IP telephone terminal sends a PB information packet, which is a packet including PB information corresponding to the push button and information on the identifier of the own terminal, to the server device. Sending an RTP packet, which is a packet containing information on the identifier of the other party, to the packet converter;
When the server apparatus receives the PB information packet from the IP telephone terminal, the server apparatus refers to the management table, identifies the data format from the identifier of the IP telephone terminal included in the PB information packet, and uses the data format. An instruction to generate a packet for sending the PB information and a packet generation request signal including the PB information are sent to the packet conversion device;
The packet conversion device reads the PB information from the packet generation request signal received from the server device, reads the identifier of the counterpart and the identifier of the IP phone terminal from the RTP packet received from the IP phone terminal, A packet including the PB information in the data format, the identifier of the partner and the identifier of the identifier of the IP telephone terminal is generated and transmitted via the network to the address specified by the identifier of the partner. .

  According to the present invention, when an IP telephone terminal transmits PB information corresponding to a push button to an external apparatus, the IP telephone terminal does not have a function of transmitting the PB information in the data format of the transmission destination apparatus. However, the transmission destination apparatus can recognize the PB information from the received packet. Therefore, even when PB information is sent to a device adopting a new protocol, it is not necessary to purchase an IP telephone terminal corresponding to the new protocol again, and an increase in communication equipment cost can be suppressed.

  The IP telephone system of the present invention is characterized by having a device that converts PB information transmitted from an IP telephone terminal into a packet that can be received by a destination device.

  The configuration of the IP telephone system of this embodiment will be described.

  FIG. 1 is a block diagram showing a configuration example of an IP telephone system according to the present embodiment.

  As shown in FIG. 1, the IP telephone system 1 according to the present embodiment corresponds to an IP telephone terminal 10, a SIP server 20 that manages information of protocols that are not supported by the IP telephone terminal 10, and instructions from the SIP server 20. And a packet conversion device 30 for generating and transmitting the packet. The IP telephone system 1 is connected to a network 130 by a packet conversion device 30. In this embodiment, as shown in FIG. 1, a plurality of IP telephone terminals 10 are provided.

  Connected to the network 130 are an IP telephone terminal 115 and a response device 150 which are communication destinations of the IP telephone terminal 10. In the present embodiment, when the response device 150 receives PB information from the IP telephone terminal 10 in a state where communication with the IP telephone terminal 10 is possible, if the data format of the PB information is not a packet based on the RFC2833 protocol, the PB information System that cannot receive Hereinafter, a packet based on the RFC2833 protocol is referred to as an RFC2833 packet.

  When the IP telephone terminal 10 establishes a call with the counterpart communication device in the same manner as in the prior art, the IP telephone terminal 10 becomes in a state where it can talk with the communication device. In this state, when the operator operates the IP telephone terminal 10 and presses the push button, the IP telephone terminal 10 of the present embodiment sends a PB information packet including the PB information and the identifier information of the own terminal to the SIP server 20. Send to. Even if the operator is not speaking, the RTP packet including information on the identifier of the own terminal and the identifier of the partner is sent to the packet conversion device 30. This RTP packet may include voice data such as noise picked up by a microphone.

  The SIP server 20 has the following configuration in addition to the same configuration as the conventional SIP server 120. A management table describing data format information for sending PB information to the responding device 150 is stored in the storage unit of the SIP server 20 for each IP telephone terminal. In the management table, the identifier of the IP telephone terminal 10 and data format information for sending the PB information are registered together. In this embodiment, RFC 2833 is registered in the management table for the IP telephone terminal 10 as a data format for sending PB information.

  The data format information is registered in the management table in the storage unit of the SIP server 20 from the IP telephone terminal 10 when the operator of the IP telephone terminal 10 operates the IP telephone terminal 10. Further, the administrator of the SIP server 20 may operate the SIP server 20 to register information on the data format that is not supported by the IP telephone terminal 10 in the management table.

  When the SIP server 20 receives the PB information packet from the IP telephone terminal 10, the SIP server 20 reads the identifier of the IP telephone terminal 10 from the PB information packet. Then, an identifier that matches the identifier is searched in the management table stored in the storage unit. When a matching identifier is found, the registered data format is read together with the identifier. Here, the registered data format is RFC2833. Subsequently, a packet generation request signal including an instruction to generate an RFC2833 packet and PB information is transmitted to the packet conversion device 30.

  FIG. 2 is a block diagram showing a configuration example of the packet conversion apparatus. As shown in FIG. 2, the packet conversion apparatus 30 includes a storage unit 31 for storing information received from the IP telephone terminal 10 and the SIP server 20, a communication unit 32 for transmitting / receiving information to / from the outside, and each unit. And a control unit 33 for controlling. The control unit 33 includes a CPU (Central Processing Unit) 34 that executes predetermined processing according to a program, and a memory 35 that stores the program.

  When receiving the packet generation request signal from the SIP server 20, the control unit 33 of the packet conversion device 30 reads the PB information from the packet generation request signal. When the RTP packet addressed to the response device 150 is received from the IP telephone terminal 10, the source identifier and the destination identifier are read from the RTP packet. Then, an RFC2833 packet including PB information by RFC2833, information on the identifier of the transmission source, and information on the identifier of the transmission destination is generated and transmitted from the communication unit 32 to the response device 150 via the network 130.

  Next, the operation procedure of the IP telephone system of this embodiment will be described.

  FIG. 3 is a diagram schematically showing the operation of the IP telephone system of the present embodiment. FIG. 4 is a flowchart showing the operation procedure of the IP telephone system of this embodiment.

  When the IP telephone terminal 10 enters a state where it can communicate with the response device 150 in the same manner as in the prior art, it transmits an RTP packet including voice data picked up by the microphone to the packet conversion device 30. The packet conversion device 30 sequentially transmits RTP packets received from the IP telephone terminal 10 to the response device 150 via the network 130.

  When the operator of the IP telephone terminal 10 operates the IP telephone terminal 10 and presses the push button, the IP telephone terminal 10 transmits a PB information packet to the SIP server 20 (step 301). Since the telephone call is still possible during this time, the IP telephone terminal 10 transmits an RTP packet addressed to the response device 150 to the packet conversion device 30 (step 302).

  When receiving the PB information packet, the SIP server 20 reads the identifier of the transmission source included in the PB information packet. Then, the management table is searched for whether or not an identifier that matches the identifier of the transmission source is registered. When a matching identifier is found, the data format registered with the identifier is checked, and it is recognized that the data format is RFC2833 (step 303).

  Subsequently, the SIP server 20 transmits a packet generation request signal to the packet conversion device 30 (step 304). The packet conversion apparatus 30 reads PB information from the packet generation request signal received from the SIP server 20. Further, the identifier of the transmission source and the identifier of the transmission destination are read from the RTP packet received from the IP telephone terminal 10. Then, an RFC2833 packet including PB information by RFC2833, information on the identifier of the transmission source and information on the identifier of the transmission destination is generated and transmitted to the responding device 150 via the network 130 (step 305).

  The IP telephone system of the present embodiment can notify PB information by push button operation to a response device that cannot receive PB information unless it is an RFC2833 packet, even if the IP telephone terminal does not support RFC2833.

  In the present embodiment, the case of RFC2833 is shown as the data format for sending the PB information, but other protocols can be similarly implemented. Any IP telephone terminal can use the response device by sending a packet suitable for the format to the response device that accepts only a packet of a specific format. The information processing by the IP telephone system of the present embodiment can be applied to a wider range of devices and systems including not only protocols but also a wide variety of hardware and software.

  If a plurality of IP telephone terminals are provided in the IP telephone system, there may be a mixture of IP telephone terminals that can send PB information in packets in RFC 2833 data format. RFC 2833 is not registered for this IP telephone terminal in the management table. The operation in this case will be briefly described below. FIG. 5 is a flowchart showing the operation procedure of the IP telephone system.

  When the operator operates the IP telephone terminal and presses the push button, the IP telephone terminal transmits an RFC2833 packet including information on the PB information, the identifier of the own terminal, and the identifier of the transmission destination to the SIP server 20 (step 401). ). Also during this time, the IP telephone terminal transmits the RTP packet to the packet conversion device 30 (step 402). When receiving the RFC2833 packet, the SIP server 20 confirms that it can be transferred as it is from the information in the management table (step 403), and transmits the RFC2833 packet to the packet converter 30 (step 404). When receiving the RFC2833 packet from the SIP server 20, the packet conversion device 30 transmits the RFC2833 packet to the response device 150 via the network 130 without sending the RTP packet received from the IP telephone terminal (step 405).

  In this embodiment, PB information of a tone signal by DTMF is transmitted.

  The configuration of the IP telephone system of this embodiment will be described. FIG. 6 is a diagram schematically showing the operation of the IP telephone system of the present embodiment. The IP telephone terminal 10 in the block diagram shown in FIG. 1 of the first embodiment is the IP telephone terminal 12, the response device 150 is the response device 152, and the other components have the same configuration. Illustration is omitted. The same reference numerals are given to the same configurations as those in the first embodiment, and the detailed description thereof is omitted.

  The IP telephone terminal 12 shown in FIG. 6 has the same configuration as that of the IP telephone terminal 10 shown in FIG. 1 except that PB information cannot be transmitted by DTMF. A response device 152 that is a communication destination of the IP telephone terminal 12 is connected to the network 130. In this embodiment, the response device 152 receives the PB information if the PB information is not a packet in the DTMF data format when receiving the PB information from the IP phone terminal 12 in a state in which communication with the IP phone terminal 12 is possible. A system that cannot. Hereinafter, a packet including PB information in the DTMF data format is referred to as a DTMF packet.

  Since the IP telephone terminal 12 does not support the DTMF data format, the identifier of the IP telephone terminal 12 and the DTMF information are registered together in the management table of the storage unit of the SIP server 20. When the SIP server 20 receives the PB information packet from the IP telephone terminal 12, the SIP server 20 reads the identifier of the IP telephone terminal 12 from the PB information packet. Then, an identifier that matches the identifier is searched in the management table. When a matching identifier is found, the registered data format is read together with the identifier. Here, the registered data format is DTMF. Subsequently, a packet generation request signal including an instruction to generate a DTMF packet and PB information is transmitted to the packet conversion device 30.

  When receiving the packet generation request signal from the SIP server 20, the packet conversion device 30 converts the PB information into a data format based on DTMF. When the RTP packet addressed to the response device 152 is received from the IP telephone terminal 12, the source identifier and the destination identifier are read from the RTP packet. Then, a DTMF packet including PB information by DTMF, information on the transmission source identifier, and information on the transmission destination identifier is generated and transmitted to the responding device 152 via the network 130.

  Next, the operation of the IP telephone system of this embodiment will be described.

  FIG. 7 is a flowchart showing the operation procedure of the IP telephone system of this embodiment.

  When the IP telephone terminal 12 enters a state where it can communicate with the response device 152 as in the conventional case, the IP telephone terminal 12 transmits an RTP packet including voice data picked up by the microphone to the packet conversion device 30. The packet conversion device 30 sequentially transmits RTP packets received from the IP telephone terminal 12 to the response device 152 via the network 130.

  When the operator of the IP telephone terminal 12 operates the IP telephone terminal 12 and presses the push button, the IP telephone terminal 12 transmits a PB information packet to the SIP server 20 (step 501). Since the telephone call is still possible during this time, the IP telephone terminal 12 transmits the RTP packet addressed to the response device 152 to the packet conversion device 30 (step 502).

  When receiving the PB information packet, the SIP server 20 reads the identifier of the transmission source included in the PB information packet. Then, the management table is searched for whether or not an identifier that matches the identifier of the transmission source is registered. When a matching identifier is found, the data format registered with the identifier is checked to recognize that the data format is DTMF (step 503).

  Subsequently, the SIP server 20 transmits a packet generation request signal to the packet conversion device 30 (step 504). The packet conversion apparatus 30 reads PB information from the packet generation request signal received from the SIP server 20. Further, the identifier of the transmission source and the identifier of the transmission destination are read from the RTP packet received from the IP telephone terminal 10. Then, a DTMF packet including PB information by DTMF, information on the sender identifier, and information on the sender identifier is generated and transmitted to the response device 152 via the network 130 (step 505).

  If the IP telephone terminal can send a packet containing PB information by DTMF, the DTMF packet sent from the IP telephone terminal is sent to the SIP server 20 and the packet in the same manner as shown in FIG. The data is sent to the response device 152 via the conversion device 30. Therefore, detailed description is omitted here.

  In the IP telephone system of the present embodiment, an IP telephone terminal that cannot send a DTMF tone signal can use a response device that operates based on the DTMF tone signal.

  In this embodiment, the case of DTMF has been described as the data format for sending the PB information. However, other data formats can be similarly implemented. Furthermore, since the tone signal by DTMF in this embodiment is sound information, in the same way as in this case, the voice data is sent to the IP telephone terminal of the communication destination by a method different from the RTP packet to make a call. You can also. An application example thereof will be described below. Here, a case where a DTMF tone signal is used will be described.

  Twelve kinds of tone signals are combined and uniquely registered in advance for each generated sound in the order of the Japanese syllabary and each sound by the musical symbol. For example, “a” to “o” in the order of the Japanese syllabary are made to correspond to “01” to “05”, respectively. In this case, the sound of “A” is composed of two tone signals of “0” by a combination of frequencies 1336 Hz and 941 Hz and “1” by a combination of frequencies 1209 Hz and 697 Hz. A table for converting each generated sound in the order of the Japanese syllabary and each sound by the music symbol into a tone signal is referred to as a conversion registration table.

  The operator operates the IP telephone terminal to store messages, music, etc. in advance in the storage unit of the IP telephone terminal, and inputs an instruction to arbitrarily select from the stored contents and transmit it to another IP telephone terminal . Subsequently, when the IP telephone terminal converts the message or music information into a tone signal in the conversion registration table and transmits the PB information to the SIP server 20, as shown in this embodiment, the IP telephone terminal sends the information to the destination IP telephone terminal. A DTMF packet is sent out. The IP telephone terminal that receives the DTMF packet returns the original message or music from the conversion registration table and outputs it from the speaker. The following can be considered as examples that can be realized by this method.

  When sending voice data to the voice recognition response device, even if the RTP packet contains noise in the RTP packet due to the state of the IP telephone terminal 11 or background noise, the voice data not containing noise is sent in the DTMF packet. Is possible. In addition, even if the voice input unit such as the microphone of the IP phone terminal is broken, the message is sent to the communication partner by a DTMF packet, and the other party's IP phone terminal returns the message to the voice data and outputs it. You can listen to messages by voice. Further, even if a person has a language function failure, when a message is input by operating an IP telephone terminal, the message can be sent to the other party by voice.

  Also, the operator inputs an instruction to operate the IP telephone terminal to transmit music, the IP telephone terminal transmits music using a DTMF packet, and the destination IP telephone terminal outputs the music from the speaker. The other party can listen to the performance. Further, by registering a table for translating into a different language in the conversion registration table in advance, when the operator inputs a message by operating the IP phone terminal, the IP phone terminal translates the message into a different language. It is possible to send a DTMF packet including the information. Here, each sound generated in the order of the Japanese syllabary and each sound based on the musical symbols are described as tone signals based on DTMF, but the sound may be expressed using other signals.

  In this embodiment, the PB information is transmitted in both RFC2833 and DTMF data formats.

  The configuration of the IP telephone system of this embodiment will be described. FIG. 8 is a diagram schematically showing the operation of the IP telephone system of this embodiment. The IP telephone terminal 10 in the block diagram shown in FIG. 1 of the first embodiment is the IP telephone terminal 14, the response device 150 is the response device 154, and the others are similar in configuration. Illustration is omitted. The same reference numerals are given to the same configurations as those in the first embodiment, and the detailed description thereof is omitted.

  The IP telephone terminal 14 shown in FIG. 8 has the same configuration as the IP telephone terminal 10 shown in FIG. 1 except that PB information in the RFC2833 and DTMF data formats cannot be transmitted. A response device 154 that is a communication destination of the IP telephone terminal 14 is connected to the network 130. In the present embodiment, when the response device 154 receives PB information from the IP telephone terminal 14 in a state where communication with the IP telephone terminal 14 is possible, if both the DTMF packet including the PB information and the RFC2833 packet are not prepared, the PB A system that cannot recognize information.

  Since the IP telephone terminal 14 is not compatible with the RFC 2833 and DTMF data formats, the management table of the storage unit of the SIP server 20 includes RFC 2833 and DTMF information as the unsupported data format of the IP telephone terminal 14. 14 identifiers are registered. When the SIP server 20 receives the PB information packet from the IP telephone terminal 14, the SIP server 20 reads the identifier of the IP telephone terminal 14 from the PB information packet. Then, an identifier that matches the identifier is searched in the management table. When a matching identifier is found, the registered data format is read together with the identifier. Here, the registered data formats are RFC2833 and DTMF. Subsequently, a packet generation request signal including an instruction to generate a DTMF packet and an RFC2833 packet and PB information is transmitted to the packet conversion device 30.

  When receiving the packet generation request signal from the SIP server 20, the packet conversion device 30 converts the PB information into a data format based on DTMF and a data format based on RFC2833. When an RTP packet addressed to the response device 154 is received from the IP telephone terminal 14, the source identifier and the destination identifier are read from the RTP packet. Then, a DTMF packet including PB information by DTMF, information on a transmission source identifier, and information on a transmission destination identifier is generated. In addition, an RFC2833 packet including PB information according to RFC2833, information on a transmission source identifier, and information on a transmission destination identifier is generated. Then, these packets are transmitted to the response device 154 via the network 130.

  Next, the operation of the IP telephone system of this embodiment will be described.

  FIG. 9 is a flowchart showing the operation procedure of the IP telephone system of this embodiment.

  When the IP telephone terminal 14 becomes ready to make a call with the response device 154 in the same manner as before, the IP telephone terminal 14 transmits an RTP packet including voice data picked up by the microphone to the packet conversion device 30. The packet conversion device 30 sequentially transmits RTP packets received from the IP telephone terminal 14 to the response device 154 via the network 130.

  When the operator of the IP phone terminal 14 operates the IP phone terminal 14 and presses the push button, the IP phone terminal 14 transmits a PB information packet to the SIP server 20 (step 601). Since the telephone call is still possible during this time, the IP telephone terminal 14 transmits an RTP packet addressed to the response device 154 to the packet conversion device 30 (step 602).

  When receiving the PB information packet, the SIP server 20 reads the identifier of the transmission source included in the PB information packet. Then, the management table is searched for whether or not an identifier that matches the identifier of the transmission source is registered. When a matching identifier is found, the data format registered with the identifier is checked, and it is recognized that the data format is DTMF and RFC2833 (step 603).

  Subsequently, the SIP server 20 transmits a packet generation request signal to the packet conversion device 30 (step 604). The packet conversion apparatus 30 reads PB information from the packet generation request signal received from the SIP server 20. Further, the identifier of the transmission source and the identifier of the transmission destination are read from the RTP packet received from the IP telephone terminal 10. Then, a DTMF packet including PB information by DTMF, information on a transmission source identifier, and information on a transmission destination identifier is generated. In addition, an RFC2833 packet including PB information according to RFC2833, information on a transmission source identifier, and information on a transmission destination identifier is generated. Subsequently, the generated DTMF packet and RFC2833 packet are transmitted to the response device 152 via the network 130 (step 605).

  The IP telephone system according to the present embodiment has the effects of the first embodiment by including the PB information in the RFC2833 packet and the effects of the second embodiment by including the PB information in the DTMF packet. In addition, a response device that cannot recognize PB information unless DTMF and RFC2833 are available can be used by an IP telephone terminal that cannot send either of them.

  When the IP telephone terminal can transmit the DTMF packet and the RFC2833 packet including the PB information, the DTMF packet and the RFC2833 packet transmitted from the IP telephone terminal are the same as those shown in FIG. The data is sent to the response device 154 via the SIP server 20 and the packet conversion device 30. Therefore, detailed description is omitted here.

  In the above-described first to third embodiments, the IP telephone system according to the present invention transmits the PB information by the push button of the operation unit of the IP telephone terminal to an external apparatus via the network in advance to the server apparatus. By storing the data format of the device, the packet conversion device sends out a packet corresponding to the data format. Therefore, even if the IP telephone terminal does not have a function of sending PB information according to the destination device, the destination device can recognize the PB information from the packet received via the packet conversion device. Become. According to the present invention, even when PB information is sent to a device adopting a new protocol, it is not necessary to purchase an IP telephone terminal corresponding to the new protocol again, and an increase in communication equipment cost can be suppressed.

  In the first to third embodiments, the SIP server 20 has a function as a proxy server. However, the SIP server 20 may have at least one of a redirect server, a registration server, and a location server. Good.

  The function of the packet conversion device 30 may be provided in a communication device such as a router. By adding the function to an existing router connected to the network, there is no need to install a new device.

1 is a block diagram illustrating a configuration example of an IP telephone system according to a first embodiment. It is a block diagram which shows the example of 1 structure of a packet converter. It is a figure which shows typically operation | movement of the IP telephone system of Example 1. FIG. 3 is a flowchart illustrating an operation procedure of the IP telephone system according to the first embodiment. 6 is a flowchart showing an operation procedure in another case in the IP telephone system according to the first embodiment. It is a figure which shows typically operation | movement of the IP telephone system of Example 2. FIG. 6 is a flowchart illustrating an operation procedure of the IP telephone system according to the second embodiment. It is a figure which shows typically operation | movement of the IP telephone system of Example 3. FIG. 10 is a flowchart illustrating an operation procedure of the IP telephone system according to the third embodiment. It is a block diagram which shows the example of 1 structure of the conventional IP telephone system. It is a flowchart which shows the operation | movement procedure until a call is established.

Explanation of symbols

10 IP telephone terminal 20 SIP server 30 Packet converter

Claims (3)

PB information packet that is information including information corresponding to the push button of the operation unit and information on the identifier of the own terminal, and an RTP packet that is information including information on the identifier of the own terminal and the identifier of the partner An IP phone terminal to send to the outside,
Management in which information of the IP telephone terminal identifier and the data format for sending the PB information to the destination is described among a plurality of data formats including a data format based on RFC communication protocol and a data format based on DTMF A table is stored, and when the PB information packet is received from the IP telephone terminal, the PB information is sent to the destination from the identifier of the IP telephone terminal included in the PB information packet with reference to the management table A server device that specifies a data format, sends an instruction to generate a packet for sending the PB information in the data format, and a packet generation request signal including the PB information to the outside;
The PB information is read from the packet generation request signal received from the server device, the identifier of the counterpart and the identifier of the IP phone terminal are read from the RTP packet received from the IP phone terminal, and the PB is sent to the counterpart A packet including information on the PB information in the data format for sending information, the identifier of the destination, and the identifier of the IP telephone terminal is generated and transmitted via the network to the address specified by the identifier of the destination A packet converter to
An IP phone system. A packet converter connected to an IP telephone terminal and a server device,
A storage unit for storing information received from the IP telephone terminal and the server device;
PB information indicating information corresponding to the push button of the operation unit of the IP telephone terminal among a plurality of data formats including a data format based on the RFC communication protocol and a data format based on DTMF is sent to the destination of the IP telephone terminal When receiving from the server device an instruction to generate a packet in a data format and a packet generation request signal including the PB information from the server device, the PB information is stored in the storage unit, and the IP telephone terminal Upon receiving the identifier and the RTP packet is a packet including information of the destination identifier, and stores the information identifier and said phase hand identifier of the IP telephone terminal in the storage unit, the PB information to the destination the PB information by the data format for sending a packet including the identifier and information of the identifier of the IP telephone terminal of the phase hand And a control unit that transmits over the network to the address specified by the identifier of the phase hand form,
A packet conversion apparatus. A packet conversion method by an IP telephone system having an IP telephone terminal, a server device, and a packet conversion device,
The server device indicates information corresponding to a push button of the operation unit of the IP telephone terminal among a plurality of types of data formats including an identifier of the IP telephone terminal , a data format based on an RFC communication protocol, and a data format based on DTMF. When information on the data format for sending PB information to the other party of the IP telephone terminal is input from the outside, information on the identifier of the IP telephone terminal and the data format for sending the PB information to the other party Is registered in the management table of the storage unit,
When the push button is pressed, the IP telephone terminal sends a PB information packet, which is a packet including PB information corresponding to the push button and information on the identifier of the own terminal, to the server device. Sending an RTP packet, which is a packet containing information on the identifier of the other party, to the packet converter;
When the server apparatus receives the PB information packet from the IP telephone terminal, the server apparatus refers to the management table and sends the PB information to the partner from the identifier of the IP telephone terminal included in the PB information packet . Specifying a data format, sending an instruction to generate a packet for sending the PB information in the data format and a packet generation request signal including the PB information to the packet converter,
The packet conversion device reads the PB information from the packet generation request signal received from the server device, reads the identifier of the counterpart and the identifier of the IP phone terminal from the RTP packet received from the IP phone terminal, A packet including the PB information in the data format for sending the PB information to the partner , the identifier of the partner, and the identifier of the IP telephone terminal is generated and addressed to the address specified by the identifier of the partner Packet conversion method for sending data over a network.

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