JP4146832B2 - Transfer method during communication, call processing server, program, and recording medium - Google Patents

Description

  The present invention relates to a transfer-in-communication method, a call processing server, a program, and a storage medium that provide a transfer-in-communication function in a voice call over an IP network.

Conventionally, a telephone system having a transfer function during communication has been developed. The in-communication transfer function means that the user A holds the user B while the user A (first terminal) and the user B (second terminal) are communicating, and dials the user C (third terminal). After calling / holding, the user B and the user C are connected by activating the transfer, thereby enabling a call between the user B and the user C.
For example, in the transfer function during communication in ISDN (Integrated Service Digital Network), the callee (transferr) holds the call from the caller and calls the third party (transferee), and then the caller The call from the person can be switched to a third party (see, for example, Patent Document 1). In addition, even when an analog telephone line is changed to an ISDN line, a system that realizes a transfer function during communication using a terminal adapter has been developed (for example, see Patent Document 2).

  In recent years, with the spread of the Internet, voice calls using an IP (Internet Protocol) network (hereinafter referred to as VoIP (Voice over IP)) have been performed. Also in this VoIP, a transfer function during communication is realized, for example, a billing method when using the transfer function during communication (for example, refer to Patent Document 3), and extension numbers are shared by a plurality of domains. There has been proposed a method (for example, refer to Patent Document 4) that can reliably transfer an incoming call even in such a case. In addition, there is a system in which an existing PBX (Private automatic Branch eXchange) is provided with a VoIP adapter so that a transfer function during communication can be virtually performed on the VoIP service.

The applicant has not yet found prior art documents related to the present invention by the time of filing other than the prior art documents specified by the prior art document information described in this specification.
JP-A-5-122396 JP 2003-163756 A JP 2003-264638 A JP 2003-032373 A

However, the conventional mid-communication transfer function in VoIP has a problem that a call is disconnected if any abnormality occurs in the terminal.
Further, when a virtual VoIP transfer function is realized by providing a VoIP adapter in an existing PBX, the cost merit of using IP is lost.
Accordingly, the present invention has been made in order to solve the above-described problems, and provides an in-communication transfer method, a call processing server, a program, and a recording medium that can realize an easy-to-use transfer function in communication. The purpose is to do.

In order to solve the above problems, a method in a communication transfer for the present invention is connected to the IP network and a plurality of IP terminals that perform voice communication via the IP network, the public is connected to the public network Between a plurality of telephone terminals that perform voice communication via a line network, a GW that is connected to the IP network and the public line network and mediates voice communication between the IP terminal and the telephone terminal, and that is connected to the IP network and between the IP terminals and an IP terminal and the call processing server and communicating transfer method in a communication system having a controlling calls between telephone terminal, hold the second IP terminal is communicating with the first IP terminal A first step of performing voice communication between the first IP terminal and the first telephone terminal via the GW while the second IP terminal is on hold; For performing transfer during communication from the IP terminal to the call processing server And a third step of establishing a communication between the second IP terminal and the one telephone terminal via the GW by the call processing server.

In the communicating transfer method, if it can not establish communication between the second IP terminal and one of the telephone terminals, the first IP terminal and a second telephone terminal in the IP terminal and 1 communicates with the one of the terminal may further have a fifth step of pending the other terminal of the second IP terminal Oyo telephone terminal beauty 1.

In the communication transfer method, the fourth step includes a sixth step of transmitting a first hold release signal instructing the second IP terminal to release the hold from the call processing server, and a second step from the call processing server. it has the a seventh step of canceling the hold of IP terminal transmits a first state notification regarding whether successful first IP terminal, a fifth step, the second IP terminal Upon receipt of the first state notification indicating that the release of the hold fails, it communicates with the one of the terminals of the second IP terminal Oyo telephone terminal beauty 1, to hold the other terminal You may do it.

The above-mentioned transfer method during communication further includes an eighth step of holding one telephone terminal prior to the fourth step, and the fourth step is a call process when the release of the hold of the second IP terminal is successful. A ninth step of transmitting a second hold release signal for instructing the release of the hold to one telephone terminal from the server via the GW, and whether or not the release of the hold of the one telephone terminal is successful from the call processing server A second status notification indicating that the release of the hold of the first telephone terminal has failed. The tenth step of transmitting a second status notification related to the first IP terminal to the first IP terminal. Upon receiving the performs communication with one of the terminals of the second IP terminal Oyo telephone terminal beauty 1 may be suspended and the other terminal.

In the communication transfer method, the first hold release signal includes the media path address of the first telephone terminal, and the second hold release signal includes the media path address of the second IP terminal. It may be.

The call processing server according to the present invention is connected to an IP network connected to a public line network via a GW, and performs a call between IP terminals that perform voice communication via the IP network and a voice via the public line network. a call processing server to control the call between the telephone terminal and the IP terminal that performs communication, communication via the second IP terminal first IP terminal is on hold and the first IP terminal and GW established via a transfer request receiving unit for receiving an instruction to perform during communication to establish a communication transfer between the first telephone terminal, the GW communication between the second IP terminal and one of the telephone terminals in and control means for the hold release means for transmitting a hold release signal for releasing the hold on the second IP terminal, the state notification about whether to establish communication between the second IP terminal and a telephone terminal And a status notification means for transmitting to the first IP terminal To do.

In the call processing server, hold releasing means, in case of failure to establish communication between the second IP terminal and one of the telephone terminals, Oyo second IP terminal to the first IP terminal to perform the communication with any one of the terminals of the telephone terminal of beauty 1, it may be caused to the other terminal of the second telephone terminal in the IP terminal and 1 on hold.

In the call processing server, the transfer request receiving means, instruction first IP terminals perform during communication transfer for establishing communications over the GW between the second IP terminal and one of the telephone terminals that are pending receive, hold release means may transmit the hold release signal for releasing the hold on the second IP terminal Oyo telephone terminal beauty 1.

In the call processing server, the hold release signal may include the media path address of the second IP terminal or the first telephone terminal.

Further, the program according to the present invention is connected to an IP network connected to a public line network via a GW and performs a call between IP terminals that perform voice communication via the IP network and voice communication via the public line network. a call processing server for a program that controls a call between the telephone terminal and the IP terminal that performs communication via a second IP terminal first IP terminal is on hold and the first IP terminal and GW the transmitting a first step of receiving an instruction to perform during communication transfer for establishing communications over the GW between the first telephone terminal in the hold release signal for releasing the hold on the second IP terminal And a third step of transmitting a status notification regarding whether or not communication between the second IP terminal and the first telephone terminal is established to the first IP terminal. .

In the above program, in case of failure to establish communication between the second IP terminal and one of the telephone terminals, either to the first IP terminal of the second IP terminal Oyo telephone terminal beauty 1 or the other terminal and to perform the communication, may further have a fourth step of the other terminal of the second telephone terminal in the IP terminal and 1 on hold.

In the program, the first step, receiving an indication that the first IP terminal performs communicating transfer for establishing communications over the GW between the second IP terminal and one of the telephone terminals that are pending and, a second step may transmit the hold release signal for releasing the hold on the second IP terminal Oyo telephone terminal beauty 1.

In the above program, the hold release signal may include the media path address of at least one of the second IP terminal or the first telephone terminal.

  A recording medium according to the present invention records the above program.

According to the present invention, since transfer during communication is realized by the call processing server, cost merit is not impaired, so it is very convenient.
Further, according to the present invention, the call processing server controls transfer during communication between the second terminal and the third terminal, and when the hold release of the second terminal or the third terminal fails, The call between the terminal and the second terminal or the third terminal is resumed. Therefore, since the call is not disconnected, it is very convenient.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a configuration diagram showing a VoIP network according to the present embodiment, and FIG. 2 is a block diagram showing a configuration of a call processing server (hereinafter referred to as CA (Call Agent)).
The VoIP network according to the present embodiment includes a CA 10 connected to the IP network 1 and a GW (Gate Way) connected to the IP network 1 and a public line network (hereinafter referred to as PSTN (Public Switched Telephone Network) 2). 20, a plurality of IP telephone terminals 30 connected to the IP network 1, and a plurality of telephone terminals 40 connected to the PSTN 2.

  The CA 10 includes at least a data communication unit 11, a control unit 12, a storage unit 13, and a transfer unit 14.

The data communication unit 11 transmits and receives various data to and from the telephone terminal 40 connected to the PSTN 2 via the IP telephone terminal 30 connected to the IP network 1 or the GW 20.
The control unit 12 controls each unit of the CA 10 and establishes communication between terminals including either the IP telephone terminal 30 or the telephone terminal 40. Thereby, the control part 12 also implement | achieves transfer during communication.
The storage unit 13 stores various data used for control by the control unit 12.

The transfer unit 14 includes a transfer request receiving unit 14a, a hold releasing unit 14b, and a status notification unit 14c, and implements a transfer function during communication.
When receiving a transfer request from the IP telephone terminal 30 or the telephone terminal 40 performing VoIP via the data communication unit 11, the transfer request receiving unit 14a transmits the received transfer request to the hold releasing unit 14b.
When the hold release unit 14 b receives the transfer request, the hold release unit 14 b generates a hold release signal instructing release of the hold state, and transmits it to the IP telephone terminal 30 or the telephone terminal 40 via the data communication unit 11.
The status notification unit 14 generates a status notification signal including information on whether or not the terminal that has transmitted the hold release signal has successfully released the hold, and transmits the status notification signal to the terminal that has requested the transfer during communication.

The data communication unit 11, the control unit 12, the storage unit 13, and the transfer unit 14 constituting the CA 10 are respectively an arithmetic device such as a CPU, a memory, a storage device such as an HDD, and an IP telephone terminal connected to the IP network 1. 30 and the terminal 40 connected to the PSTN 2 via the GW 20, an I / F device for transmitting and receiving various information, an input device such as a keyboard and a mouse, a CRT (Cathode Ray Tube), an LCD (Liquid Crystal Display), an FED ( It consists of a computer equipped with a display device such as Field Emission Display) or organic EL (Electro Luminescence) and a program installed in this computer, that is, the hardware device is controlled by the program, that is, Each function is realized by cooperation of hardware resources and software.
The program may be recorded on a recording medium such as a CD (Compact Disc), a DVD (Digital Versatile Disk), or a flexible disk, and may be installed in the computer using this recording medium. The program received via the IP network 1 to which the CA 10 is connected may be installed in the computer.

  The GW 20 is connected to the IP network 1 and the PSTN 2 and mediates communication between the IP telephone terminal 30 and the telephone terminal 40.

Next, with reference to FIG. 3, an outline of the operation of the transfer function during communication in the VoIP network according to the present embodiment will be described. FIGS. 3A to 3D are diagrams for explaining a transfer operation during communication in the VoIP network according to the present embodiment.
In FIG. 3, solid arrows indicate communication, dotted arrows indicate suspension, and alternate long and short dash arrows indicate communication paths for various signals.

As shown in FIG. 3A, when two IP telephone terminals 30 (hereinafter referred to as terminals A and B) connected to the IP network 1 are communicating, the terminal A is connected to the terminals B and PSTN2. A case in which a transfer during communication with the telephone terminal 40 (hereinafter referred to as terminal C) is performed will be described.
When the terminal A and the terminal B are in a call, information such as a media path address for specifying the other terminal and making a call is transmitted to each of the terminal A and the terminal B by the CA 10.
The media path address may include various data such as voice, image, text, etc., in addition to information specifying the other terminal such as an IP address.

Next, as shown in FIG. 3B, the terminal A puts the communication with the terminal B on hold and starts the communication with the terminal C.
The terminal A puts the call with the terminal B on hold by detecting the user's pressing of the hold button or the like. At this time, the terminal A transmits to the terminal B a hold signal indicating that the call with the terminal B is put on hold.
Further, the terminal A starts communication with the terminal C by detecting that the telephone number of the terminal C is dialed by the user. At this time, the terminal A notifies the CA 10 that the telephone number of the terminal C has been dialed. Then, the CA 10 notifies the GW 20 of the notified telephone number. The GW 20 identifies the terminal C from the telephone number notified from the CA 10. When the CA 10 is notified from the GW 20 that the terminal C has been specified, the CA 10 notifies the terminal A of information such as a media path address for specifying the GW 20 specifying the terminal C and making a call. The terminal A accesses the GW 20 based on the notified media path address, and when the terminal C responds to the call from the terminal A, a call path between the terminal A and the terminal C is established.

  When terminal B receives the hold signal from terminal A, terminal B outputs a hold sound from the speaker and notifies the user that the call with terminal A is in a hold state.

Next, as shown in FIG. 3C, the terminal A puts the communication with the terminal C on hold.
The terminal A puts the call with the terminal C on hold by detecting the user's pressing of the hold button or the like.

Next, when terminal A transmits a transfer request signal to CA 10, communication is started between terminal B and terminal C as shown in FIG.
Here, specific examples of the trigger for transmitting the transfer request signal to the CA 10 include the following.
When one terminal is on hold and communicating with another terminal, the user of the terminal that performs transfer during communication places the terminal on-hook.
When communication is being performed with another terminal while one terminal is on hold, a terminal performing a transfer during communication detects a hold operation such as pressing of a hold button by the user.
In a state where the two terminals are put on hold, an operation input for transmitting a transfer request by the user is detected by the terminal performing transfer during communication.

  Next, the communication transfer function shown in FIG. 3D will be described in detail with reference to FIG. FIG. 4 is a sequence diagram for explaining the operation of the transfer function during communication. Here, a case where transfer during communication is performed between the terminal B and the terminal C communicating with the terminal A will be described as an example.

  Communication between terminal A and terminal B is on hold (step S401), communication between terminal A and terminal C is put on hold (step S402), and a transfer request signal is transmitted from terminal A to CA 10 (step S402). (S403), CA 10 generates a hold release signal and transmits it to terminal B (step S404). At this time, the CA 10 transmits the media path address information of the terminal C to the terminal B together with the hold release signal.

  In this embodiment, the transfer request signal is transmitted after the communication between the terminal A and the terminal C is suspended. However, the transfer request signal may be transmitted simultaneously with the suspension. Further, the transfer request may be transmitted without putting the communication between the terminal A and the terminal C on hold.

Further, the transfer request signal may include the media path address of the terminal that performs transfer during a call. As a result, the CA 10 can transmit the media path address of the terminal C to the terminal B.
Further, the CA 10 may store information related to communication of each terminal in the storage unit 13. Even in this case, the CA 10 transmits the voice path address of the terminal C to the terminal B by searching for the media path address of the terminal C based on the information related to the communication of the terminal A stored in the storage unit 13. It becomes possible.

  When the hold release response signal indicating that the hold release has been normally performed is received from the terminal B (step S405), the CA 10 generates a state notification signal including information regarding the successful release of the hold of the terminal B, and the terminal A is transmitted to A (step S406).

Next, the CA 10 generates a hold release signal and transmits it to the terminal C (step S407). At this time, the CA 10 transmits the media path address information of the terminal B to the terminal C together with the hold release signal. As a result, voice communication between the terminal B and the terminal C becomes possible.
Note that the CA 10 transmits the media path address of the terminal B to the terminal C based on the transfer request signal or the storage unit 13 as described above.

Here, the terminal C is the telephone terminal 40 connected to the PSTN 2 as described above. Therefore, the media path address of the terminal B transmitted to the terminal C is transmitted to the GW 20, and the GW 20 performs control such as a hold release and a transfer during communication which will be described later.
The terminal C may be the IP telephone terminal 30. In this case, by performing operation control equivalent to that of the terminal B, a transfer operation during communication is realized.

  When the hold release response signal indicating that the hold release has been normally performed is received from the terminal C (step S408), the CA 10 generates a state notification signal including information related to the successful release of the hold of the terminal B, and the terminal A is transmitted to A (step S409). As described above, when it is detected that the hold between the terminal B and the terminal C is normally released, the terminal A determines that the transfer during communication between the terminal B and the terminal C is successful. At this time, the terminal A may display on the display screen of the terminal A that the transfer during communication is successful, or may send a sound indicating that the transfer during communication is successful from a speaker. By this. The user of terminal A can recognize that the transfer during communication was successful.

  Terminal B and terminal C that have received each other's call path address start a call (step S410). The call between the terminal B and the terminal C can be started at any stage as long as it is after step S408. For example, it may be started at the same time as step S408 or before step S409.

  As described above, according to the present embodiment, since the transfer request signal and the status notification signal are transmitted and received only between the terminal (terminal A) requesting transfer during communication and the CA 10, the terminal performing transfer during communication ( Terminals B and C) only receive the hold release signal and do not need to operate with an understanding of special call control. Therefore, since it is possible to operate without developing a new protocol or the like, early business development is possible.

  In this embodiment, the hold release signal is transmitted to terminal B first, but the hold release signal may be transmitted to terminal C first.

Next, with reference to FIG. 5, the operation when the hold release fails will be described. FIG. 5 is a sequence diagram for explaining the operation of the in-communication transfer function in which the release of hold has failed.
Note that FIG. 5 illustrates an example in which the hold release of the terminal B illustrated in FIG. 4 fails. Therefore, steps S401 to S404 in FIG. 4 and steps S501 to S504 shown in FIG.

  When the hold release failure signal indicating that the hold release has failed is received from the terminal B in response to the transmission of the hold release signal (step S505), the CA 10 includes a status notification including information regarding the failure of the terminal B to release the hold. A signal is generated and transmitted to terminal A (step S506).

  When receiving a status notification signal indicating that the release of the hold has failed, the terminal A notifies the user that the transfer during communication has failed (step S507). For example, the notification to the user may be displayed on the display screen of the terminal A indicating that the transfer during communication has failed, or a sound indicating that the transfer during communication has failed may be transmitted from a speaker. Moreover, when the terminal A is put off-hook, a doorbell may be sounded. Thereby, the user of the terminal A can recognize that the transfer during communication has failed.

  When the user is notified, the terminal A releases the hold of the terminal C by the normal hold release operation, that is, the hold release operation by the terminal A instead of the hold release operation by the CA 10 (step S508), and sends a response to the hold release from the terminal C. When it is received (step S509), the call with the terminal C is resumed (step S510). At this time, terminal B continues to be on hold (step S511).

  Thereby, in this embodiment, even if the hold release fails, the call with the terminal that has been put on hold is resumed, so the call is not disconnected.

Next, with reference to FIG. 6, the operation in another case where the release of the hold has failed will be described. FIG. 6 is a sequence diagram for explaining the operation of the in-communication transfer function in which the hold release has failed.
Note that FIG. 6 illustrates an example in which the hold cancellation of the terminal C illustrated in FIG. 4 fails. Accordingly, steps S401 to S407 in FIG. 4 and steps S601 to 607 shown in FIG. Also, the description of the same parts as those described in FIGS. 3 and 5 will be omitted as appropriate.

  When a hold release failure signal indicating that the hold release has failed is received from the terminal C in response to the transmission of the hold release signal (step S608), the CA 10 includes a status notification including information on the failure of the hold release of the terminal C. A signal is generated and transmitted to terminal A (step S609).

  When receiving the status notification signal indicating that the release of the hold has failed, the terminal A notifies the user that the transfer during communication has failed (step S610). For example, the notification to the user may be displayed on the display screen of the terminal A indicating that the transfer during communication has failed, or a sound indicating that the transfer during communication has failed may be transmitted from a speaker. Thereby, the user of the terminal A can recognize that the transfer during communication has failed.

  When notified to the user, the terminal A releases the hold of the terminal C by a normal hold release signal operation and puts the terminal B on hold (steps S611 to 614). As a result, the terminal A resumes the call with the terminal C and continues the holding state of the terminal B (steps S615 and S616).

  Thus, in the present embodiment, even if the hold release fails, the call with the terminal that has been put on hold is resumed, so the call is not disconnected.

  5 and 6, it has been described that the call with the terminal C is resumed. However, the call with the terminal B may be resumed and the terminal C may be put on hold. In this case, since it is possible to select which terminal to resume the call by a known method such as lamp control of the hold button of the terminal A, the user can arbitrarily select a terminal to resume the call.

As described above, according to the present embodiment, the transfer during communication between the terminal B and the terminal C is controlled by the CA, and when the hold release fails, the hold is released by the terminal A and the call is resumed. Therefore, since the call is not disconnected as in the prior art, it is very convenient.
Further, according to the present invention, since transfer during communication is realized by CA, cost merit is not impaired, so that it is very convenient.

It is a block diagram which shows the network of VoIP which concerns on this Embodiment. It is a block diagram which shows the structure of CA. (A)-(d) It is a figure explaining the transfer operation in communication in the network of VoIP which concerns on this Embodiment. It is a sequence diagram explaining operation | movement of the transfer function during communication. It is a sequence diagram explaining operation | movement of the transfer function in communication in which cancellation | release of hold | maintenance failed. It is a sequence diagram explaining other operation | movement of the transfer function in communication in which cancellation | release of hold | pay failed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... IP network, 2 ... PSTN, 10 ... CA, 11 ... Data communication part, 12 ... Control part, 13 ... Memory | storage part, 14 ... Transfer part, 14a ... Activation request | requirement receiving part, 14b ... Reservation release part, 14c ... State Notification unit, 20 GW.

Claims (14)

Wherein a plurality of IP terminals that perform voice communication is connected to the IP network through the IP network, and a plurality of telephone terminals that perform voice communication via the public network is connected to the public network, and the IP network public is connected to the network, it controls the call between the GW for mediating voice communication, which is connected to the IP network and the IP terminal and between the IP terminal and the telephone terminal between the IP terminal and the telephone terminal A communication transfer method in a communication system comprising a call processing server that includes:
A first step of placing a second IP terminal communicating with the first IP terminal on hold;
A second step of performing voice communication between the first IP terminal and one telephone terminal via the GW while the second IP terminal is on hold;
A third step of issuing an instruction to perform transfer during communication from the first IP terminal to the call processing server;
And a fourth step of establishing communication between the second IP terminal and the first telephone terminal via the GW by the call processing server. When said it could not establish communication between the second IP terminal and the first telephone terminal, one of the first 1 IP terminal and the second IP terminal and the one of the telephone terminal It communicates with the one terminal, according to claim 1, further comprising a fifth step of the hold other terminal of the second IP terminal and the one of the telephone terminal Transfer method during communication. The fourth step includes
A sixth step of transmitting a first hold release signal instructing the second IP terminal to release the hold from the call processing server;
A seventh step of transmitting, from the call processing server, a first status notification as to whether or not the cancellation of the hold of the second IP terminal has succeeded, to the first IP terminal;
Have
The fifth step includes
Between the the second for receiving the first state notification indicating that the release of the hold of IP terminal fails, one of terminals of the second IP terminal and the one of the telephone terminal The in-communication transfer method according to claim 2, wherein communication is performed and the other terminal is put on hold. And further comprising an eighth step of holding the first telephone terminal prior to the fourth step,
The fourth step includes
When releasing the hold of the second IP terminal is successful, a ninth step of transmitting a second hold release signal instructing to release the hold on the first telephone terminal via the GW from the call processing server ,
A tenth step of sending a second status notification from the call processing server to the first IP terminal as to whether or not the cancellation of the hold of the first telephone terminal is successful;
Have
The fifth step includes
When receiving the second state notification indicating the failure to release the hold of the first telephone terminal, the communication between the second IP terminal and one terminal of the first telephone terminal 4. The in-communication transfer method according to claim 3, wherein the other terminal is put on hold. The first hold release signal includes the media path address of the first telephone terminal,
The transfer method during communication according to claim 4, wherein the second hold release signal includes a media path address of the second IP terminal. A telephone terminal and an IP terminal connected to an IP network connected to a public line network via a GW and performing a call between IP terminals performing voice communication via the IP network and voice communication via the public line network A call processing server for controlling calls to and from
An instruction to perform transfer during communication to establish communication between the second IP terminal held by the first IP terminal and the first IP terminal and one telephone terminal communicating with the GW A transfer request receiving means for receiving;
Control means for establishing communication between the second IP terminal and the first telephone terminal via the GW;
Hold release means for sending a hold release signal for releasing the hold to the second IP terminal;
Status notification means for transmitting to the first IP terminal a status notification regarding whether or not communication between the second IP terminal and the first telephone terminal has been established;
Call processing server, characterized in that it comprises a. If the hold release means fails to establish communication between the second IP terminal and the first telephone terminal, the hold releasing means sends the second IP terminal and the first IP terminal to the first IP terminal. 7. The call processing server according to claim 6 , wherein communication with any one of the telephone terminals is performed, and the other terminal of the second IP terminal and the first telephone terminal is put on hold . The transfer request receiving means provides an instruction to perform transfer during communication to establish communication between the second IP terminal held by the first IP terminal and the first telephone terminal via the GW. Receive,
Said hold releasing means, the call processing server according to claim 7, wherein the that sends a hold release signal for releasing the hold on the second IP terminal and the one of the telephone terminal. Wherein the hold release signal, the call processing server according to any one of claims 6 to 8, characterized in that that is part of said second IP terminal or media path address of the telephone terminal of the 1. A telephone terminal and an IP terminal connected to an IP network connected to a public line network via a GW and performing a call between IP terminals performing voice communication via the IP network and voice communication via the public line network A program of a call processing server for controlling calls between
During communication for establishing communication via the GW between the second IP terminal held by the first IP terminal and the first IP terminal communicating with the first IP terminal via the GW A first step of receiving an instruction to perform the transfer;
A second step of transmitting a hold release signal for releasing the hold to the second IP terminal;
A third step of transmitting to the first IP terminal a status notification regarding whether or not communication has been established between the second IP terminal and the first telephone terminal;
Program characterized Rukoto to have a. If the communication between the second IP terminal and the first telephone terminal fails, either the second IP terminal or the first telephone terminal is selected as the first IP terminal. Fourth step for communicating with one terminal and putting the other terminal of the second IP terminal and the first telephone terminal on hold
The program according to claim 10 , further comprising: In the first step, an instruction to perform a transfer during communication for establishing communication via the GW between the second IP terminal put on hold by the first IP terminal and the first telephone terminal is issued. Receive,
12. The program according to claim 11 , wherein the second step transmits a hold release signal for releasing the hold to the second IP terminal and the first telephone terminal . The program according to any one of claims 10 to 12 , wherein the hold release signal includes a media path address of at least one of the second IP terminal or the first telephone terminal . A recording medium on which the program according to any one of claims 10 to 13 is recorded .

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