JPH06133047A - Virtual path control system - Google Patents

Abstract

PURPOSE:To independently control the same path from a starting destination service control program while a path control right is remained as it is from a service control program which is already executed when plural services co exist. CONSTITUTION:In the coexistence of basic output connection service and tripartite call service, paths (1)-(4) and (2)-(3) through a tripartite call trunk ADT are diagonally stretched as against a path (1)-(2). For making call waiting service coexist, paths (1)-(6) and (4)-(5) through CWT are diagonally stretched as against the path (1)-(4). Thus, the control path of the service control program which is already executed is made virtual.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a virtual path control method and, more particularly, to a virtual path control method effective when a plurality of services coexist among the call path control methods of an exchange having a call path device.

[0002]

2. Description of the Related Art In conventional switching software, when an attempt is made to activate another service B while a certain service A is being implemented, the call control program of the service A calls the service B.
The call control program was transferred to the above call control program. Regarding path control, the path controlled by the call control program of service A was controlled only by the call control program of service B after service B was started. That is, the call control program of the service B of the transfer destination takes over and controls the path control of the service A. Therefore, the service call control program started during the execution of a certain service needs to make a state transition by including the "service state transition" in the service specification of the transition source. The call control program was created so that it could satisfy several service specifications. Therefore, when a certain service specification is changed, the change is often spread to all service call control programs that can be transferred from this service, and the changed portions of the program are scattered.

[0003]

In this conventional service migration method, there are scattered program changes with respect to a certain service specification change, and it is necessary to grasp all related service specifications. Therefore, there is a problem that a bug is likely to occur when the program is changed due to the change of the service specification. Further, in the conventional path control method, when another service is started while a certain service is being executed, an attempt is made to control the path from the service call control program to be started while leaving the path control right from the service control program being executed. , Because a conflict occurs and the path states become inconsistent,
There is a problem in that the same path cannot be controlled independently from multiple service call control programs.

[0004]

The virtual path control system of the present invention is a virtual path of an exchange having a speech path device and a service device connected to a subscriber through the speech path device for realizing an additional service. In the control method, a first path that is already in a call state in the first service is created by a request from another second service to create a crossing path to virtualize the first path. The service-provided subscriber is connected to the service device without changing the first service state.

Further, the invention is characterized in that the crossing path is restored at the end of the second service state without changing the first service state. The first service is a three-way calling service, and the second service is
The service is a call waiting service.

[0006]

According to the virtual path control method of the present invention, when another service is attempted to be activated while a certain service is being executed, the respective services can coexist and independent path control can be performed. Easy to create and change.

[0007]

The present invention will be described below with reference to the drawings. FIG. 1 is a path connection control related diagram on a service coexistence side showing an embodiment of a virtual path control method of the present invention.
The relationship between each service call control state and the path control state diagram is shown.

The path connection diagram in FIG. 1 is a diagram showing the entire path connection when a three-way call service and a call waiting service are sequentially made to coexist during a basic outgoing connection service call. In the coexistence of the basic outgoing connection service and the three-way calling service, a three-way call trunk (ADT) is used while subscribers A and B are talking on the path of the basic outgoing connection call service.
A three-way call between the subscribers A, B, and C is realized by arranging the paths-and-via the tie. Further, when the call waiting service coexists, the call waiting service is provided by providing a path with a path-,-through a call waiting trunk (hereinafter referred to as CWT). At this time, the ring back tone RB is given to the calling subscriber D.
T is sent out. Control objects are shown separately for each service in the call state diagram and path state diagram for each service in FIG.

In the present embodiment, the call connection state of each service is not affected by the services that are added and coexist afterward, and does not depend on the services that already exist. That is, the call control of each service can be controlled without being affected by other coexisting services. On the contrary, the path control program manages the relationship of the paths being used by each service. This will be described with reference to FIG.

FIG. 2 is a diagram showing a state transition example on the side of the path control program in this embodiment. 2 in FIG. 2 corresponds to 1 in FIG. First, a path during a call is set up in the basic outgoing connection service (state 1). Next, the three-party call service coexists according to the three-party call service request. At this time, a crossing path setting request (trigger 1) is input to state 1, and state 1 is separated into state 2 and state 3.
State 2 is controlled by the basic outgoing connection service call control, and state 3 is controlled by the three-way call service call control. Further, since the call waiting coexistence coexists with the state 2, when the crossing path setting request (trigger 2) is input, the state 2 is already a virtual path by the state 3, and therefore the state 3 is set with the crossing path setting. Make a request. In the state 3, the states are separated similarly to the trigger 1, and the states 4 and 5 are transited. State 5 is controlled from the call waiting service call control.

Further, when the path being used by the call waiting service is restored, the call control of the call waiting service issues a restoration request (trigger 3) to the path control program. The path control side sets its own state (state 5) to vacant and notifies state 4 that it has been recovered. When the path being used by the three-party call service is restored first, the call control of the three-party call service issues a restoration request (trigger 4) to the path control program. The path control side sets its own state (state 4) to vacant and notifies the states 2 and 5 that it has recovered.

In this way, the path control side separates the states and establishes the connection between the services, thereby maintaining the independence of the service call control side.

FIG. 3 is a diagram showing an example of state transition of the service call control side program in FIG. In FIG. 3, when a signal is input during an outgoing connection call (step S1) (S2), it is determined whether this signal is a request for activation of a three-way call service, and if so (YES in S3), three-way call An activation request is issued to the service call control (S4), and the user maintains the original state and does not change.

Upon receiving the activation request (S6), the three-party call service call control establishes a crossing path between the subscribers A and B (S7), and transits from the idle state (S5) to the in-service state (S8). Coexist with outgoing connection service.

[0015]

As described above, according to the present invention, the same path is controlled from a plurality of services by imagining the path and establishing a crossing path, so that the first service is already in a call state. With respect to the existing path, it is possible to make the additional service coexist without changing the original service state by another service request after the second, and it is possible to easily create and change the service call control program. .

[Brief description of drawings]

FIG. 1 is a diagram relating to path connection control on a service coexistence side showing an embodiment of a virtual path control system of the present invention.

FIG. 2 is a diagram showing an example of state transition on the side of a path control program in the present embodiment.

FIG. 3 is a diagram showing an example of state transition of a service call control side program in FIG.

[Explanation of symbols]

 A, B, C, D subscriber ADT three-way call trunk CWT call waiting trunk

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiko Suwa 5-7-1, Shiba, Minato-ku, Tokyo NEC Corporation (72) Inventor Toshihiro Kai 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph Telephone Co., Ltd. (72) Inventor Etsuko Katayama 1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Isao Shinbo 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Information Communication Division (72) Kunihiko Koinari 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi Information & Communication Division (72) Inventor Hiroyuki Tsuneyoshi 1015 Odanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited

Claims (3)

[Claims] 1. A virtual path control system for an exchange having a call path device and a service device connected to a subscriber via the call path device for realizing an additional service, wherein a call is already made for a first service. For the first path that is in the state, a crossing path is created by requesting another second service, and the first path is virtualized to provide the service without changing the first service state. A virtual path control system characterized in that a subscriber is connected to the service device. 2. The virtual path control method according to claim 1, wherein, at the end of the second service state, the crossing path is restored without changing the first service state. 3. The virtual path control method according to claim 1, wherein the first service is a three-way call service, and the second service is a call waiting service.