JP4094474B2 - Telephone network line hold recall system - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a line hold recall system for an IP telephone network or a public telephone network.
[0002]
[Prior art]
Conventionally, as a method for holding a line in a telephone network, as shown in FIG. 1, End-End between a calling party subscriber accommodation switch and a destination subscriber accommodation switch and between a subscriber terminal and each switch. The line hold function has been realized by securing call processing resources. In this conventional line hold system, even if a disconnection signal is received from the calling subscriber during communication, call holding resources are not released until the disconnection signal is received from the called party, and the line is held. is doing. Therefore, when a recall signal is received from the telephone terminal on the called side, the line resource is still secured, so the calling subscriber can be called without encountering the calling party during communication with another subscriber. It becomes possible to call.
[0003]
As for the line hold system in the IP network, the IP network is connectionless communication path connection, so it is impossible to physically hold the line in the same connection path. For this reason, there is currently no provision of a calling party recall function from the called party with a hold function.
[0004]
[Problems to be solved by the invention]
In an IP network, there is no concept of line hold (end-to-end resource reservation) due to connectionless communication path connection method. Therefore, even if a call is called from the called side, the line is always captured. It was not always possible. If the calling subscriber originates for communication to another subscriber before the reconnection request from the called party, or the incoming call from another subscriber makes a transition to the busy state, the called party Even if there is a recall request from, the connection is not possible because the line is in use.
[0005]
In the public telephone network, even if the calling terminal generates a line disconnection signal, line resources are maintained unless a call disconnecting signal is generated from the called terminal. If the called terminal does not transmit a recall signal, the line resource is occupied unnecessarily, and a situation contrary to the effective use of the line resource occurs.
[0006]
Accordingly, an object of the present invention is to provide a line hold / recall system for a telephone network that can use the line hold / recall function even in an IP telephone network.
Furthermore, another object of the present invention is to realize a telephone network line hold recall system that can prevent useless holding of line resources in a public telephone network.
[0007]
[Means for Solving the Invention]
The telephone network line hold recall system according to the present invention comprises a plurality of subscriber accommodation nodes for accommodating a plurality of telephone terminals, and when the telephone terminal makes a call, the calling side subscriber accommodation node and the destination side subscriber accommodation node are provided. The call signal is transmitted to the callee terminal via the call terminal, and the callee terminal that has received the call signal transmits a response signal to the callee receiving node, and the callee from the callee receiving node. In a telephone network line hold and recall system in which a response signal is transferred to a subscriber accommodation node and communication is performed between a calling telephone terminal and a called telephone terminal.
Each subscriber accommodation node has a database storing subscriber information including identification information of the telephone terminals to be accommodated and information identifying whether or not the telephone terminals are to receive a line hold call service, and the telephone terminals to be accommodated. When there is a call, when the incoming telephone terminal is a telephone terminal that receives a line hold recall service, a first storage means for storing identification information of the calling telephone terminal and the called telephone terminal, and a called telephone terminal A means for adding information indicating that it is the target of the line hold recall service to the response signal of the telephone, and a telephone that receives the line hold recall service when the response signal is received from the subscriber accommodating node on the called side Second storage means for storing information representing a set of terminals,
When receiving a call signal addressed to the telephone terminal to be accommodated, the called subscriber accommodating node searches the database to determine whether or not the called telephone terminal is a telephone terminal that receives a line hold recall service. In the case of a telephone terminal that receives a line hold recall service, identification information of the calling telephone terminal and the called telephone terminal is stored in the first storage means, and a response signal from the called telephone terminal is sent to the line hold recall service. Add the information to indicate that it is eligible and forward it to the originating subscriber accommodation node,
The calling side subscriber accommodation node that has received the response signal stores information indicating that the call is a target of the hold recall service and identification information of the calling side telephone terminal and the called side telephone terminal of the call in the second storage means. Remember
The incoming and outgoing subscriber accommodation nodes continue to hold the information stored in the first storage means and the second storage means until receiving a line disconnection signal from the destination telephone terminal. .
[0008]
In order to solve the above-described conventional problems, the present invention communicates by controlling call connection between an IP subscriber or telephone network subscriber when the IP subscriber line or telephone network subscriber line makes or receives a call. Transition to the middle state. Information that can identify that it is necessary to prevent the call from the subscriber telephone terminal to another telephone terminal or the incoming call from another telephone terminal for the call transited to the communication state. Alternatively, in the call setup state before the communication is established, the call is transmitted from the called side to the subscriber accommodation server or the exchange on the calling side. The subscriber accommodation node on the calling side has a function of holding the information received from the called side until receiving a disconnection request from the called side. Furthermore, when a disconnection signal is received from the caller while this information is held, the call is released and the state is changed to a vacant state, but a new call is made from the same subscriber. Identifies the outgoing call from the target subscriber of the outgoing / incoming call suppression target call with a precedent server or exchange, and sends the call from the subscriber to another subscriber or the incoming call from another subscriber. A server and an exchange having a function of inhibiting are used. With this configuration, it is possible to effectively use line resources by eliminating useless use of line resources.
[0009]
If the calling server or exchange receives a recall signal from the first called subscriber while the new calling or incoming call is being suppressed after disconnecting from the calling subscriber, the first called subscriber Information that can be identified as a re-calling is held, the incoming call is permitted even when the incoming call to the calling subscriber is suppressed, and a reconnection function is made by transition to a communication-in-progress state. In addition, when a disconnection signal is received from the called party in this state, it has a function to stop the outgoing / incoming call suppression function, so that not only the IP subscriber but also the telephone network subscriber can make a call to the subscriber. It is possible to provide a recalling ability by suppressing incoming calls.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 2 is a configuration example of a system according to an embodiment of the present invention. The communication network 1 includes a plurality of subscriber accommodation nodes 2 and 3. The subscriber accommodation node 2 accommodates a telephone terminal 4, and the subscriber accommodation node 3 accommodates a telephone terminal 5. For the sake of clarity, only two subscriber accommodation nodes are shown, but it is assumed that a plurality of subscriber accommodation nodes are connected. Each subscriber accommodation node 2 and 3 shall accommodate a plurality of telephone terminals. Here, the communication network 1 can be an IP network, a PSTN network (public switched telephone network), or a composite network of an IP network and a public telephone network. In the case of an IP network, the subscriber accommodation node may be an IP telephone server such as a SIP Proxy server or an H323 gatekeeper. In the case of a public telephone network, the subscriber accommodation node is a subscriber exchange, that is, a digital exchange.
[0011]
3 and 4 are block diagrams showing an example of the configuration of the subscriber accommodation node. FIG. 3 is a block diagram showing functions when operating as a subscriber accommodation node on the receiving side. FIG. It is a block which shows a function in the case of operating as a subscriber accommodation node. Referring to FIG. 3, the subscriber accommodation node has a subscriber accommodation unit (terminal communication function) 11, and the subscriber accommodation unit 11 accommodates a plurality of telephone terminals. Further, it has a trunk line accommodation unit (relay communication function) 12 and is connected to a subscriber accommodation node on the transmission side via a relay network. Further, the subscriber accommodation node has a subscriber information database 13 storing subscriber information including identification information of the accommodated subscriber and information regarding whether the accommodated subscriber is a person who receives the line hold recall service. If the telephone terminal that has received the call is a telephone terminal that receives the line hold recall service, it also includes a hold recall register 14 that stores that the call is a call that receives the hold recall service. As this information, for example, the identification information of the telephone terminal and the identification information of the calling telephone terminal can be used. Further, the subscriber accommodation node determines whether or not the call is the target of the hold recall, and communicates by determining whether the call is a hold target communication determination function 15, a recall function 16, a hold target call communication function 17, and suppression information setting / cancellation An arithmetic processing unit 19 including a function 18 is provided, and the sequence of the line holding / recalling service is executed under the control of the arithmetic means unit 19.
[0012]
When functioning as a caller node, the subscriber accommodation node, in addition to the above-described components, is notified by the callee node that it is a call subject to line hold recall. And an arithmetic unit 19 further includes an incoming / outgoing call suppression function 21.
[0013]
Next, the processing sequence of the line hold recall service will be described. 5 and 6 are diagrams showing the processing operations of the calling terminal 4, the calling node 2, the receiving node 3, and the called terminal 5. FIG. In response to a call from the originating side 1, a calling signal is transmitted from the calling node 2 to the called node 3 via the relay network, and a calling signal is sent from the called node to the called terminal 5 for calling. Done.
[0014]
When the destination terminal 5 responds, a response signal is sent to the destination node 3.
When the destination node 5 receives the response signal from the destination terminal, the destination node 5 searches the database 13 in which the subscriber information is stored, and determines whether the communication is to the service target of “pending recall”. Judge whether or not. When it is a target of the service of “hold recall” The combination information of the terminal set to “hold recall” in the hold recall register 14 is, for example, identification information such as an uninitiated telephone number and the telephone number of the destination terminal, etc. Is added to the response signal transferred to the originating node 3 by the hold target communication determination function 15 and information indicating that the communication is the target of the “hold recall” service.
[0015]
When the calling side node 2 receives a response signal to which information indicating that the communication is the target of “pending recall” is added from the destination side node 3, the terminal of “pending recall” is stored in the held recall register 20. As the combination information, identification information such as the telephone number of the calling terminal and identification information such as the telephone number of the called terminal are recorded, and a response signal is transmitted to the calling terminal 4. As a result, line resources are secured, and communication is performed between the calling terminal and the called terminal.
[0016]
In the present invention, when a line disconnection signal is generated from the originating side 4 after the end of communication or during communication, the line resource is released, but the call set in the hold recall register 13 of the destination node 3 is held. Information that is subject to the recall service is not discarded, and information that indicates that the call stored in the pending recall register 20 of the originating node 2 is subject to the pending recall service is also discarded. Keep it as it is. That is, in the present invention, the information indicating that the call is the target call of the hold recall service stored in the registers 14 and 20 is held as it is until a line disconnection signal is generated from the called terminal, and the called terminal is put on hold. Maintain state.
[0017]
In the originating node 2, during the period from when the line disconnection signal is generated from the originating terminal 4 until the disconnection signal is generated from the terminating terminal, the terminal node included in the held recall setting information stored in the register 20 When a call signal is received, a rejection response is made to a call from a terminal other than the called terminal in the combination information of the terminal for which the held recall is set. In addition, when a call signal for a new call is received from the beginning of the call, a call is made to a terminal other than the called terminal included in the combination information of the terminals that are stored in the register 20 and are set to be held-recalled. The call is rejected. Therefore, the calling terminal is maintained in a kind of hold state until it receives a disconnection signal from the called terminal.
[0018]
After the disconnection signal is sent from the calling end 4 and the communication is disconnected once, the destination node 3 receives a “recall” signal (such as a call with a special number) from the destination end 5. At this time, the calling signal is transmitted to the calling side terminal 4 via the calling side node 2 using the information of the “hold / recall” setting stored in the register 14. Since the calling side node 2 receives the calling value number between the calling end and the called terminal that matches the combination information of the terminals included in the “holding recall” setting information stored in the register 20, Then, a call signal is sent to the calling end. Thereby, it is possible to receive a recall service.
[0019]
Since both the calling node and the called node receive the disconnection signal from the called terminal, the combination information of the terminals set in the above-mentioned “hold / recall” and “hold / recall” settings is retained. Even if the originating end is disconnected, until the terminating end is disconnected, the originating end cannot make a call to other than the terminating terminal, and the originating terminal cannot receive an incoming call from other than the terminating terminal, The connection to the unterminated terminal and the recall from the terminating terminal can be performed in the same manner as the line hold / recall of the existing telephone network without always holding the line resource.
[0020]
【The invention's effect】
As described above, according to the method and the node (server, exchange, etc.) according to the present invention, the function equivalent to the function that enables reconnection when the line is held in the existing telephone network without always holding the line. Can be realized without changing the message sequence, and in particular, the addition of functions to nodes (servers, exchanges, etc.) can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing a conventional line hold / recall connection method;
FIG. 2 is a diagram showing an example of a telephone network according to the present invention.
FIG. 3 is a block diagram showing an example of a subscriber accommodation node.
FIG. 4 is a block diagram illustrating an example of a subscriber accommodation node.
FIG. 5 is a diagram showing an example of a processing sequence of the line hold recall system according to the present invention.
FIG. 6 is a diagram showing an example of a processing sequence of the line hold recall system according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Communication network 2, 3 Subscriber accommodation node 4, 5 Telephone terminal 11 Subscriber accommodation unit 12 Relay line accommodation unit 13 Subscriber information database 14 Reservation recall register 15 Retention target communication judgment function 16 Recall function 17 Retention target call notification Function 18 Suppression state setting / cancellation function 19 Arithmetic processor 20 Reserved recall register 21 Incoming / outgoing call suppression function

Claims (11)

A plurality of subscriber accommodation nodes that accommodate a plurality of telephone terminals, and when the telephone terminal makes a call, an incoming call signal is sent to the destination telephone terminal via the originating side subscriber accommodation node and the destination side subscriber accommodation node. The called telephone terminal that is transmitted and receives the incoming call signal transmits a response signal to the called subscriber accommodating node, and the response signal is transferred from the called subscriber accommodating node to the calling subscriber accommodating node. In an IP telephone network line hold and recall system in which communication is performed between a telephone terminal and a called telephone terminal,
Each subscriber accommodation node has a database storing subscriber information including identification information of the telephone terminals to be accommodated and information identifying whether or not the telephone terminals are to receive a line hold call service, and the telephone terminals to be accommodated. When there is a call, when the incoming telephone terminal is a telephone terminal that receives a line hold recall service, a first storage means for storing identification information of the calling telephone terminal and the called telephone terminal, and a called telephone terminal and means for adding information indicating that it is an object of the response signal to the line hold recall services, upon receiving a response signal from the subscriber accommodation node of the called telephone terminal to which the call is subjected to line hold recall service Second storage means for storing information indicating that the set is
When the receiving subscriber receiving node receives a response signal from the accommodating telephone terminal, it searches the database to determine whether or not the called telephone terminal is a telephone terminal that receives a line hold recall service. In the case of a telephone terminal that receives a hold recall service, the identification information of the calling telephone terminal and the called telephone terminal is stored in the first storage means, and the response signal from the called telephone terminal is the target of the line hold recall service. transferred to subscriber accommodation node on the originating side adds information indicating that there,
The calling side subscriber accommodation node that has received the response signal stores information indicating that the call is a target of the hold recall service and identification information of the calling side telephone terminal and the called side telephone terminal of the call in the second storage means. Remember
The incoming and outgoing subscriber accommodation nodes continue to hold the information stored in the first storage means and the second storage means until receiving a line disconnection signal from the destination telephone terminal. IP telephone network line hold recall system. In the IP telephone network line hold recall system according to claim 1,
The receiving subscriber accommodating node continues to hold the information stored in the first storage means even after receiving a line disconnection signal generated from the calling telephone terminal, and then recalls and calls from the called telephone terminal. When the signal is received, the recall calling signal is transferred to the originating subscriber accommodation node based on the information stored in the first storage means, and the originating subscriber accommodation node A line hold recall system for an IP telephone network, wherein a call signal is transmitted to a calling telephone terminal based on information stored in the storage means. In the IP telephone network line hold recall system according to claim 2,
The calling side subscriber accommodation node receives a line disconnection signal from the calling side telephone terminal and then receives a new line from the calling side telephone terminal within a period until receiving the line disconnection signal generated from the called side telephone terminal. Even if a call signal is received, a rejection response is made for the call, and even if a call signal addressed to the caller telephone terminal is received from a telephone terminal other than the callee telephone terminal, a rejection response is made for the call signal. A line hold recall system for an IP telephone network. 4. The circuit holding / recall system for an IP telephone network according to any one of claims 1 to 3, wherein the originating subscriber accommodating node and the terminating subscriber accommodating node are designated as SIP proxy servers or H323 gatekeepers. A telephone network line holding / recall system characterized by comprising an IP telephone server . An IP telephone server used for an IP telephone network that accommodates a plurality of telephone terminals, functions as a subscriber accommodating node on a caller side and a callee side, and has a line hold recall service function,
A database storing subscriber information including identification information of a telephone terminal to be accommodated and information identifying whether or not the telephone terminal receives a line holding call service, and when an incoming call is received at the telephone terminal to be accommodated When the received telephone terminal is a telephone terminal that receives the line hold recall service, the first storage means for storing the identification information of the calling telephone terminal and the called telephone terminal, and when a response signal is received from the called telephone terminal A means for adding information indicating the fact to the response signal and transferring the information to the calling party accommodating node when the called terminal is a telephone terminal that receives a line hold recall service; and a terminating subscriber accommodating node And a second storage means for storing information indicating that the call is a set of telephone terminals that receive a line hold recall service when a response signal is received from
When functioning as a subscriber-side subscriber accommodation node, when receiving a call signal addressed to a telephone terminal to be accommodated, whether or not the destination telephone terminal receives a line hold recall service by searching the database In the case of a telephone terminal that receives the line hold recall service, the identification information of the calling telephone terminal and the called telephone terminal is stored in the first storage means, and the line hold re-transmission is received in the response signal from the called telephone terminal. Add the information indicating that it is the target of the paging service and transfer it to the calling party's subscriber accommodation node.
When functioning as an originating subscriber accommodation node that has received a response signal from a destination telephone terminal, the call is subject to a hold recall service and identification of the calling telephone terminal and the destination telephone terminal of the call Storing information in the second storage means;
The incoming and outgoing subscriber accommodation nodes continue to hold the information stored in the first storage means and the second storage means until receiving a line disconnection signal from the destination telephone terminal. IP phone server . 6. The IP telephone server according to claim 5, wherein when functioning as a subscriber accommodating node on the caller side, a line cut signal from the callee telephone terminal is received until a line cut signal is received from the caller telephone terminal. When a call signal is received from the caller phone terminal to a phone terminal other than the callee phone terminal within the period, or when a call signal is received from a phone terminal other than the callee phone terminal, An IP telephone server, which makes a rejection response to a call signal and an incoming call signal . A plurality of subscriber accommodation nodes that accommodate a plurality of telephone terminals, and when the telephone terminal makes a call, an incoming call signal is sent to the destination telephone terminal via the originating side subscriber accommodation node and the destination side subscriber accommodation node. The called telephone terminal that is transmitted and receives the incoming call signal transmits a response signal to the called subscriber accommodating node, and the response signal is transferred from the called subscriber accommodating node to the calling subscriber accommodating node. In the line hold and recall system of the public telephone network in which communication is performed between the telephone terminal and the called telephone terminal,
Each subscriber accommodation node has a database storing subscriber information including identification information of the telephone terminals to be accommodated and information identifying whether or not the telephone terminals are to receive a line hold call service, and the telephone terminals to be accommodated. When there is a call, when the incoming telephone terminal is a telephone terminal that receives a line hold recall service, a first storage means for storing identification information of the calling telephone terminal and the called telephone terminal, and a called telephone terminal Means for adding information indicating that it is a target of a line hold recall service to a response signal of the telephone, and a telephone terminal that receives the line hold recall service when receiving a response signal from a subscriber accommodation node on the receiving side Second storage means for storing information indicating that the set is
When the receiving subscriber receiving node receives a response signal from the accommodating telephone terminal, it searches the database to determine whether or not the called telephone terminal is a telephone terminal that receives a line hold recall service. In the case of a telephone terminal that receives a hold recall service, the identification information of the calling telephone terminal and the called telephone terminal is stored in the first storage means, and the response signal from the called telephone terminal is the target of the line hold recall service. Add the information indicating that it is there and forward it to the originating subscriber accommodation node,
The calling side subscriber accommodation node that has received the response signal stores information indicating that the call is a target of the hold recall service and identification information of the calling side telephone terminal and the called side telephone terminal of the call in the second storage means. Remember
When the response signal from the called telephone terminal is transferred to the calling telephone terminal, communication is performed with line resources secured between the calling telephone terminal and the called telephone terminal. If the disconnection signal is generated, wherein at line resources are released, the subscriber yield capacity nodes called party and the calling party, the until receiving the line disconnection signal from the called side telephone terminal first storing means and the A line holding / recalling system for a public telephone network, characterized in that the information stored in the storage means is kept . The public telephone network line hold recall system according to claim 7,
The receiving subscriber accommodating node continues to hold the information stored in the first storage means even after receiving a line disconnection signal generated from the calling telephone terminal, and then recalls and calls from the called telephone terminal. When the signal is received, the recall calling signal is transferred to the originating subscriber accommodation node based on the information stored in the first storage means, and the originating subscriber accommodation node A calling signal is transmitted to the calling telephone terminal based on the information stored in the storage means of 2,
The calling side subscriber accommodation node receives a line disconnection signal from the calling side telephone terminal and then receives a new line from the calling side telephone terminal within a period until receiving the line disconnection signal generated from the called side telephone terminal. Even if a call signal is received, a rejection response is made for the call, and even if a call signal addressed to the caller telephone terminal is received from a telephone terminal other than the callee telephone terminal, a rejection response is made for the call signal. A line hold recall system for a public telephone network . A plurality of subscriber accommodation nodes that accommodate a plurality of telephone terminals, and when the telephone terminal makes a call, an incoming call signal is sent to the destination telephone terminal via the originating side subscriber accommodation node and the destination side subscriber accommodation node. The called telephone terminal that is transmitted and receives the incoming call signal transmits a response signal to the called subscriber accommodating node, and the response signal is transferred from the called subscriber accommodating node to the calling subscriber accommodating node. In a telephone network line hold and recall system in which communication is performed between a telephone terminal and a called telephone terminal,
The telephone network includes an IP telephone network and a public telephone network,
When performing communication line holding and recalling between the receiving subscriber accommodating node accommodated in the IP telephone network and the terminating subscriber accommodating node accommodated in the public telephone network, or in the public telephone network When performing communication line holding and recalling between the accommodated receiving subscriber accommodating node and the terminating subscriber accommodating node accommodated in the IP telephone network,
Each subscriber accommodation node has a database storing subscriber information including identification information of the telephone terminals to be accommodated and information identifying whether or not the telephone terminals are to receive a line hold call service, and the telephone terminals to be accommodated. When there is a call, when the incoming telephone terminal is a telephone terminal that receives a line hold recall service, a first storage means for storing identification information of the calling telephone terminal and the called telephone terminal, and a called telephone terminal Means for adding information indicating that it is a target of a line hold recall service to a response signal of the telephone, and a telephone terminal that receives the line hold recall service when receiving a response signal from a subscriber accommodation node on the receiving side Second storage means for storing information indicating that the set is
When the receiving subscriber receiving node receives a response signal from the accommodating telephone terminal, it searches the database to determine whether or not the called telephone terminal is a telephone terminal that receives a line hold recall service. In the case of a telephone terminal that receives a hold recall service, the identification information of the calling telephone terminal and the called telephone terminal is stored in the first storage means, and the response signal from the called telephone terminal is the target of the line hold recall service. Add the information indicating that it is there and forward it to the originating subscriber accommodation node,
The calling side subscriber accommodation node that has received the response signal stores information indicating that the call is a target of the hold recall service and identification information of the calling side telephone terminal and the called side telephone terminal of the call in the second storage means. Remember
The incoming and outgoing subscriber accommodation nodes continue to hold the information stored in the first storage means and the second storage means until receiving a line disconnection signal from the destination telephone terminal. Telephone network line hold recall system . A subscriber accommodation node having a transmission side subscriber accommodation unit and a reception side subscriber accommodation unit that accommodates a plurality of telephone terminals, and when the telephone terminal makes a call, the transmission side subscriber accommodation unit and the reception side subscriber An incoming call signal is transmitted to the called side telephone terminal via the accommodation unit, and the called side telephone terminal that has received the incoming call signal transmits a response signal to the called side subscriber accommodation unit, and the incoming side subscriber accommodation A response signal is transferred from the calling side to the calling side subscriber accommodation unit, and the calling side telephone terminal and the called side telephone terminal In an IP telephone network line hold and recall system in which communication is performed with a terminal,
The subscriber accommodation node includes a database storing subscriber information including identification information of a accommodated telephone terminal and information identifying whether or not the telephone terminal receives a line hold call service, and an incoming call to the accommodated telephone terminal. When the received telephone terminal is a telephone terminal that receives a line hold recall service, the first storage means for storing the identification information of the calling telephone terminal and the called telephone terminal, Means for adding information indicating that it is a target of a line hold recall service to the response signal, and a telephone terminal that receives the response signal from the called subscriber accommodation unit when the call receives the line hold recall service. Second storage means for storing information representing a set, and
The receiving side subscriber accommodation unit, when receiving a response signal from the accommodated telephone terminal, searches the database to determine whether the called side telephone terminal is a telephone terminal that receives a line hold recall service; In the case of a telephone terminal that receives a hold recall service, the identification information of the calling telephone terminal and the called telephone terminal is stored in the first storage means, and the response signal from the called telephone terminal is the target of the line hold recall service. Add information indicating that it is forwarded to the calling subscriber accommodation unit,
The calling subscriber accommodation unit that has received the response signal stores information indicating that the call is a target of the hold recall service and identification information of the calling telephone terminal and the called telephone terminal of the call in the second storage unit. Remember
The calling-side subscriber accommodation unit and the called-side subscriber accommodation unit continue to hold the information stored in the first storage unit and the second storage unit until a line disconnection signal is received from the destination telephone terminal. A line hold recall system for an IP telephone network. An IP telephone server for use in an IP telephone network having a calling party subscriber accommodating section and a receiving subscriber accommodating section for accommodating a plurality of telephone terminals, and having a line hold recall service function,
A database storing subscriber information including identification information of a telephone terminal to be accommodated and information identifying whether or not the telephone terminal receives a line holding call service, and when an incoming call is received at the telephone terminal to be accommodated When the received telephone terminal is a telephone terminal that receives the line hold recall service, the first storage means for storing the identification information of the calling telephone terminal and the called telephone terminal, and when a response signal is received from the called telephone terminal A means for adding information indicating the fact to a response signal and transferring the information to the calling side subscriber accommodation unit when the called side telephone terminal is a telephone terminal receiving a line hold recall service; and the called side subscriber accommodation unit And a second storage means for storing information indicating that the call is a set of telephone terminals that receive a line hold recall service when a response signal is received from
When the receiving subscriber accommodating unit receives a call signal addressed to the accommodating telephone terminal, it searches the database to determine whether the called telephone terminal is a telephone terminal that receives a line hold recall service. In the case of a telephone terminal that receives a line hold recall service, identification information of the calling telephone terminal and the called telephone terminal is stored in the first storage means, and a response signal from the called telephone terminal is sent to the line hold recall service. Add the information indicating that it is the target and forward to the calling subscriber accommodation unit,
The calling side subscriber accommodation unit that has received the response signal from the called side telephone terminal indicates that the call is a subject of the hold recall service and the identification information of the calling side call terminal and the called side telephone terminal of the call Memorize in the second memory means,
The calling-side subscriber accommodation unit and the called-side subscriber accommodation unit continue to hold the information stored in the first storage unit and the second storage unit until a line disconnection signal is received from the destination telephone terminal. An IP telephone server characterized by the above.

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