JP2004320649A - Line suspension recalling system of telephone network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a line suspension recalling system of a telephone network which uses a line suspension recalling system function even in an IP telephone network, and at the same time, can prevent wasteful suspension of line resources in a public telephone network. <P>SOLUTION: When a subscriber accommodation node of a terminating side (3) receives an originating signal to an accommodated telephone terminal (5), it searches a database (14), and discriminates whether the terminating side telephone terminal is a telephone terminal which has line suspension recalling service, or not. If it is a telephone terminal which has the line suspension recalling services, the node stores identification information of the originating side telephone terminal (4) and the terminating side telephone terminal (5) in the 1st means, and transfers the information to the originating side subscriber accommodation node adding information which displays that the terminal is an object of the line suspension recalling services to an answer signal from the terminating side telephone terminal. An originating side node (3) stores that the call is an object of the line suspension recalling services in a 2nd memory means. The terminating side and the originating side subscriber accommodation nodes continues to hold the stored information in the 1st memory means and the 2nd memory means until a line disconnect signal from the terminating side telephone terminal is received. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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]
2. Description of the Related Art Conventionally, as a line holding method in a telephone network, as shown in FIG. 1, End to End between a subscriber's exchange and a subscriber's exchange on the receiving side and between the subscriber's terminal and each exchange as shown in FIG. The line hold function has been realized by securing call processing resources. With this conventional line holding system, even if a disconnection signal is received from the calling subscriber during communication, call processing resources are not released until the disconnection signal is received from the called party, and the line is held. are doing. Therefore, when a recall signal is received from the called telephone terminal, since the line resources are still secured, the calling subscriber can be identified without encountering the calling party during communication with another subscriber. Can be called.
[0003]
In addition, regarding the line holding method in the IP network, since the IP network is a connection-less communication path connection, it is impossible to physically hold the line on the same connection path. Therefore, a function of recalling a calling subscriber from a called party with a hold function is not currently provided.
[0004]
[Problems to be solved by the invention]
In an IP network, there is no concept of line holding (resource reservation between End and End) due to a connectionless communication path connection method, and therefore, even if a call is called again from the called side, the line is always captured. It was not always possible. If the calling party originated a call for communication to another subscriber before the reconnection request from the called party, or transitioned to the communicating state due to an incoming call from another subscriber, Even if there is a recall request from, connection is not possible because the line is in use.
[0005]
In the public telephone network, even if the originating terminal generates a line disconnection signal, the line resources are maintained as long as the disconnection signal is not generated from the destination terminal, so that after the originating terminal generates the disconnection signal, If the receiving terminal does not transmit the recall signal, the line resources are wastefully occupied, and a situation contrary to the effective use of the line resources occurs.
[0006]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a line hold / recall system for a telephone network which can utilize the line hold / recall function even in an IP telephone network.
Still another object of the present invention is to realize a telephone network line hold recall system capable of preventing useless holding of line resources in a public telephone network.
[0007]
Means for Solving the Invention
A line hold / recall system for a telephone network according to the present invention comprises a plurality of subscriber accommodation nodes accommodating a plurality of telephone terminals, and when a telephone terminal makes a call, the originating subscriber accommodation node and the destination subscriber accommodation node are connected. A calling signal is transmitted to the called telephone terminal via the receiving side, and the called telephone terminal receiving the calling signal transmits a response signal to the called subscriber accommodation node, and the called subscriber accommodation node transmits the call signal from the called subscriber accommodation node. In a line hold and recall system of a telephone network 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 of the subscriber accommodating nodes has a database storing subscriber information including identification information of the telephone terminal to be accommodated and information for identifying whether or not the telephone terminal is to receive the line hold call service. A first storing means for storing identification information of a calling telephone terminal and a called telephone terminal when the called telephone terminal receives a line hold recall service when a call is received; Means for adding information indicating that the call is to be held by the line hold recall service to the response signal of the call, and a telephone receiving the line hold recall service when the response signal is received from the subscriber accommodation node on the receiving side. Second storage means for storing information indicating a set of terminals,
When receiving the calling signal addressed to the telephone terminal to be accommodated, the subscriber accommodation node on the receiving side searches the database to determine whether or not the called telephone terminal is a telephone terminal to receive the line hold recall service. In the case of a telephone terminal receiving the line hold recall service, the identification information of the calling side telephone terminal and the called side telephone terminal is stored in the first storage means, and a response signal from the called side telephone terminal is used for the line hold recall service. Adds information indicating that it is the target and forwards it to the originating subscriber accommodation node,
The originating subscriber accommodating node that has received the response signal stores in the second storage means that the call is the object of the hold recall service and the identification information of the calling telephone terminal and the called telephone terminal of the call. To remember
The subscriber accommodation nodes on the receiving side and the calling side continue to hold the information stored in the first storage means and the second storage means until receiving the line disconnection signal from the called telephone terminal. .
[0008]
SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a method for controlling a call connection between an IP subscriber and a telephone network subscriber when the IP subscriber line or the telephone network subscriber line originates or receives a call. Transitions to the middle state. Information that identifies that it is necessary to suppress the call from the subscriber telephone terminal to another telephone terminal or the incoming call from another telephone terminal for the call that has transitioned to the communicating state is transmitted to the communicating state of the call. Alternatively, in the state where a call is being set before the communication is established, the call is transmitted from the called side to the subscriber accommodating server or exchange on the calling side. The originating subscriber accommodating node has a function of retaining the information received from the receiving side until receiving a disconnection request from the receiving side. Further, while holding this information, if a disconnection signal is received from the caller, the call is released and the state is changed to an empty state, but if a call is newly transmitted from the same subscriber, Shall identify that it is an outgoing call from the target subscriber of the call for which the call is to be suppressed by the precedent server or exchange, and make the outgoing call from that subscriber to another subscriber or the incoming call from another subscriber. A server and an exchange, each having a function of suppressing the information, are used. With this configuration, it is possible to eliminate the useless use of the line resource and to effectively use the line resource.
[0009]
If a recall signal from the first called party is received by the calling server or exchange while the new outgoing call or incoming call is suppressed after disconnection from the calling party, It holds information that can be identified as a recall, allows incoming calls even in a call-inhibited state to the calling subscriber, and has a reconnection function by transitioning to a communicating state. In addition, when a disconnection signal is received from the called party in this state, a function for stopping the calling / calling inhibiting function is provided, so that not only IP subscribers but also telephone network subscribers can send / receive calls to subscribers. It is possible to provide recalling ability by suppressing incoming calls.
[0010]
BEST MODE FOR CARRYING OUT 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. Although only two subscriber accommodation nodes are shown in the figure for clarity, it is assumed that a plurality of subscriber accommodation nodes are connected. Each of the subscriber accommodation nodes 2 and 3 accommodates a plurality of telephone terminals. Here, the communication network 1 can be an IP network or 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 can 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 accommodating node is a subscriber exchange, that is, a digital exchange.
[0011]
3 and 4 are block diagrams showing an example of the configuration of a subscriber accommodation node. FIG. 3 is a block diagram showing functions when the subscriber accommodation node operates as a called subscriber node. FIG. It is a block which shows the function at the time of operating as a subscriber accommodation node. Referring to FIG. 3, the subscriber accommodation node has a subscriber accommodation unit (terminal communication function) 11, which accommodates a plurality of telephone terminals. It also has a trunk accommodating section (relay communication function) 12, and connects to a subscriber accommodating node on the transmission side via a relay network. Further, the subscriber accommodating node has a subscriber information database 13 storing subscriber information including identification information of the accommodated subscriber and information as to whether the accommodated subscriber is a person who receives the line hold recall service. In the case where the telephone terminal receiving the call is a telephone terminal receiving the line hold recall service, the telephone terminal further includes a hold recall register 14 for storing that the call is a call receiving 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 accommodating node determines whether or not the call is a target of hold / recall and performs communication with the hold target communication determination function 15, recall function 16, hold target call communication function 17, and setting / cancellation of inhibition information. An arithmetic processing unit 19 including a function 18 is provided, and under the control of the arithmetic unit 19, a line hold recall service sequence is executed.
[0012]
When functioning as the originating node, the subscriber accommodating node shall, in addition to the above-described components, apply the hold recall service when the called node notifies that the call is subject to the line hold recall. The arithmetic means device 19 further includes an incoming / outgoing call inhibiting function 21.
[0013]
Next, a processing sequence of the line hold recall service will be described. 5 and 6 are diagrams showing processing operations of the calling terminal 4, the calling node 2, the called node 3, and the called terminal 5. In response to a call from the calling end 1, a calling signal is transmitted from the calling node 2 to the called node 3 via the relay network, a calling signal is sent from the called node to the called terminal 5, and a call is made. Done.
[0014]
When the receiving terminal 5 responds, a response signal is sent to the receiving node 3.
Upon receiving the response signal from the called terminal, the called node 5 searches the database 13 storing the subscriber information and determines whether the communication is to the service end of the service target of “hold recall”. Determine whether or not. In the case of the service of "hold recall", as the combination information of the terminal set to "hold recall" in the hold recall register 14, for example, the identification information such as the telephone number of the originating terminal and the telephone number of the destination terminal And the information indicating that the communication is an object of the “hold recall” service is added to the response signal transferred to the originating node 3 by the hold target communication determination function 15.
[0015]
When the originating node 2 receives from the destination node 3 a response signal to which information indicating that the communication is a “hold recall” target is added, the “hold held recall” terminal 20 is stored in the held recall register 20. As the combination information, the identification information such as the telephone number of the uninitiated terminal and the identification information such as the telephone number of the destination terminal are recorded, and a response signal is transmitted to the uninitiated 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 end 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. The information that is the object of the recall service is not discarded, and the information stored in the held recall register 20 of the originating node 2 indicating that the call is the object of the hold recall service is also discarded. And keep it as it is. That is, in the present invention, the information indicating that the call is the target of the hold recall service stored in the registers 14 and 20 is held as it is until a line disconnection signal from the called terminal is generated, and the called terminal is held. Keep in state.
[0017]
In the transmitting node 2, during the period from when the line disconnection signal is generated from the calling terminal 4 to when the disconnection signal is generated from the receiving terminal, the terminal included in the held recall setting information stored in the register 20 is not changed. 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. Further, when a call signal for a new call is received from the calling end, a call to a terminal other than the called terminal included in the combination information of the terminal in the held recall setting stored in the register 20 is output. The call is rejected. Therefore, the originating terminal is maintained in a kind of hold state until receiving the disconnection signal from the receiving terminal.
[0018]
A disconnect signal is sent from the originating end 4 and after 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, a call signal is transmitted to the calling terminal 4 through the calling node 2 using the information of the “hold / recall” setting stored in the register 14. The calling node 2 receives the calling value between the calling terminal and the called terminal that matches the combination information of the terminals included in the “suspended recall” setting information stored in the register 20. , And sends a call signal to the calling end. Thereby, a recall service can be received.
[0019]
Until both the calling node and the called node receive the disconnection signal from the called terminal, the combination information of the terminals for which "hold / recall" and "hold / recall" are being set is held. Therefore, even if the originating end is disconnected, the originating end cannot make a call to another destination terminal until the destination end is disconnected, and the originating terminal cannot receive an incoming call from other than the destination terminal, The connection to the non-terminating end 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 resources.
[0020]
【The invention's effect】
As described above, according to the method and the node (server, exchange, etc.) according to the present invention, a function equivalent to a 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, so that 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 holding / recalling 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 illustrating 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]
REFERENCE SIGNS LIST 1 communication network 2, 3 subscriber accommodating node 4, 5 telephone terminal 11 subscriber accommodating unit 12 trunk line accommodating unit 13 subscriber information database 14 hold recall register 15 hold target communication determination function 16 recall function 17 hold target call notification Function 18 Suppression state setting / cancellation function 19 Processing unit 20 Held recall register 21 Outgoing / incoming call suppression function

Claims (9)

A plurality of subscriber accommodation nodes accommodating a plurality of telephone terminals are provided, and when a telephone terminal makes a call, an incoming call signal is sent to the destination telephone terminal via the originating subscriber accommodation node and the destination subscriber accommodation node. The called telephone terminal that has received and received the incoming call signal transmits a response signal to the receiving subscriber accommodation node, and the response signal is transferred from the receiving subscriber accommodation node to the calling subscriber accommodation node, and the calling telephone terminal receives the response signal. In a line hold and recall system of a telephone network in which communication is performed between a telephone terminal and a called telephone terminal,
Each of the subscriber accommodating nodes has a database storing subscriber information including identification information of the telephone terminal to be accommodated and information for identifying whether or not the telephone terminal is to receive the line hold call service. A first storing means for storing identification information of a calling telephone terminal and a called telephone terminal when the called telephone terminal receives a line hold recall service when a call is received; Means for adding information indicating that the call is to be held by the line hold recall service to the response signal of the call, and a telephone receiving the line hold recall service when the response signal is received from the subscriber accommodation node on the receiving side. Second storage means for storing information indicating a set of terminals,
Upon receiving a response signal from the accommodated telephone terminal, the called subscriber accommodation node searches the database to determine whether the called telephone terminal is a telephone terminal that receives the line hold recall service, and In the case of a telephone terminal receiving the hold recall service, the 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 used for the line hold recall service. The information indicating that there is is added and transferred to the originating subscriber accommodation node,
The originating subscriber accommodating node that has received the response signal stores in the second storage means that the call is the object of the hold recall service and the identification information of the calling telephone terminal and the called telephone terminal of the call. To remember
The subscriber accommodation nodes on the receiving side and the calling side continue to hold the information stored in the first storage means and the second storage means until receiving the line disconnection signal from the called telephone terminal. Telephone network line hold recall system. 2. The telephone line holding and recalling system according to claim 1, wherein said subscriber's accommodation node on the receiving side stores the line disconnection signal generated from the calling side telephone terminal in said first storage means. Information, and when receiving a recall signal from the destination telephone terminal, based on the information stored in the first storage means, recalls the call signal based on the information stored in the first storage means. And transmitting the calling signal to the calling telephone terminal based on the information stored in the second storage means. Recall system. After receiving the line disconnection signal from the calling telephone terminal, the originating subscriber accommodation node receives a new line disconnection signal generated from the called telephone terminal, and then receives a new line from the calling telephone terminal. Even if a call signal is received, the call is rejected and the call is rejected, and a call signal addressed to the caller is received from a telephone terminal other than the called telephone terminal. A line hold recall system for a telephone network. 4. The line hold / recall system for a telephone network according to claim 1, wherein said telephone network is a public telephone network, and a response signal from a called telephone terminal is transferred to a calling telephone terminal. A line hold and recall system for a telephone network, wherein line communication is performed between a calling telephone terminal and a called telephone terminal while securing line resources. 5. The line holding and recalling system for a telephone network according to claim 4, wherein when a line disconnection signal is generated from said calling side telephone terminal, said line resources are released, but said calling side and called side subscriber accommodating nodes receive the line resources. A line hold and recall system for a telephone network, wherein the information stored in the first and second storage means is maintained until a line disconnection signal is received from a called telephone terminal. 4. The line hold / recall system for a telephone network according to claim 1, wherein said telephone network is an IP telephone network. 7. The line holding and recalling system for a telephone network according to claim 6, wherein the subscriber accommodating node on the originating side and the subscriber accommodating node on the receiving side are IP telephone servers including a SIP proxy server or an H323 gatekeeper. Line recall system for the telephone network. A digital exchange used in a telephone network accommodating a plurality of telephone terminals, functioning as a subscriber accommodation node on a calling side and a called side, and having a line hold recall service function,
A database storing subscriber information including identification information of the accommodated telephone terminal and information as to whether or not the telephone terminal is to receive the line hold call service. If the called telephone terminal receives the line hold recall service, the first storage means for storing identification information of the calling telephone terminal and the called telephone terminal, and a response signal received from the called telephone terminal Means for adding, to the response signal, information indicating that the destination telephone terminal is a telephone terminal receiving the line hold recall service to the response signal and transferring the information to the originating subscriber accommodation node;
Second storage means for storing, when receiving a response signal from the subscriber accommodation node on the receiving side, information indicating that the call is a set of telephone terminals receiving the line hold recall service,
When functioning as a subscriber accommodation node on the receiving side, upon receiving a call signal addressed to the telephone terminal to be accommodated, the database is searched to determine whether or not the called telephone terminal is a telephone terminal that receives the line hold recall service. In the case of the telephone terminal receiving 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 response signal from the called telephone terminal is used for the line hold recall. Adds information indicating that it is the subject of the call service and forwards it to the subscriber accommodation node on the calling side,
When functioning as the originating subscriber accommodation node that has received the response signal from the called telephone terminal, the call is subject to the hold / recall service, and identification of the calling telephone terminal and the called telephone terminal of the call is performed. Storing information in said second storage means;
The digital exchange, wherein the subscriber accommodation nodes on the receiving side and the originating side continue to hold the information stored in the storage means until receiving the line disconnection signal from the receiving side telephone terminal. 9. The digital exchange according to claim 8, wherein, when functioning as a subscriber accommodating node on the calling side, a period from receiving a line disconnection signal from the calling side telephone terminal to receiving a line disconnection signal from the called side telephone terminal. When a call signal from the calling telephone terminal to a telephone terminal other than the called telephone terminal is received or a call signal from a telephone terminal other than the called telephone terminal is received, A digital exchange characterized by performing a rejection response to a signal and an incoming signal.

Images