JPH0398354A - Call interrupt system - Google Patents

Abstract

PURPOSE:To avoid the increase in the overhead by allowing a packet exchange accommodating a caller terminal equipment to apply call interrupt processing after a connection end signal to a call setting request is received when a call interrupt request is implemented. CONSTITUTION:When a call setting request is implemented by a subscriber terminal equipment 20, a call setting request packet is sent to a called exchange 10B represented by the call setting request from a caller packet exchange 10A accommodating the caller terminal equipment making the call setting request. When the caller packet exchange 10A receives a call interrupt request from the caller terminal equipment during the call setting state, the caller packet exchange 10A applies call interrupt processing after the connection end packet to the call setting request packet is received. Thus, since the call interrupt processing by a conventional interrupt call search is not required, the call interrupt processing at the called packet exchange is simplified and the increase in the overhead is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a call disconnection method, particularly to a call disconnection method advantageously applied to a packet switching network.

(Prior Art) In a packet switching network having a plurality of packet switches, the packet switches in the network are interconnected through trunk lines. Each subscriber terminal accommodated in each packet switch exchanges information with a desired subscriber terminal accommodated in another switch by sending a call setup request to the other packet switch via a trunk line. I can do it.

When a packet switch receives a call setup request from a subscriber terminal that it accommodates, it determines whether the call setup is enabled within its own switch. For example, if the received call setup request is a connection request to a subscriber terminal accommodated in another exchange, this packet switch, as the originating exchange, Sends a call setup request packet to the switch. When the receiving side exchange receives this call setup request packet, it performs call processing for the corresponding subscriber terminal.D Conventionally, in connection processing between terminals accommodated in such a packet switch, the calling terminal Upon receiving a call disconnection request, the originating exchange immediately sends a call disconnection request packet to the terminating exchange even if the call is being set up. When the receiving side exchange receives a call disconnection request packet, it searches the call control memory generated by the call setup request packet based on the link information notified in this packet, and performs the process of disconnecting the call. .

(Problem to be Solved by the Invention) However, in the packet-switched network of the prior art, since the above-mentioned disconnection process is performed, when supporting call forwarding service or representative selection service, the forwarding destination by these services is There is a problem in that the search range for the call to be disconnected is limited. Therefore, unless the processing capacity is limited to 3', it is impossible to set forwarding destinations over a wider range using conventional technology.For this reason, subscribers cannot
For example, it was not possible to enjoy call transfer services between exchanges or between networks. In addition, in exchanges that are configured with multiple packet processing units, representative selection services that form groups across multiple units, or call forwarding services that forward incoming calls between these multiple units also reduce the overhead required to search for disconnected calls. Growth was inevitable.

The present invention eliminates the drawbacks of the prior art, omits the call disconnection process at the called device, and thereby supports call forwarding services and representative selection services without limiting the forwarding range of incoming calls. The purpose of this invention is to provide a method for disconnecting calls.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a packet switching network having a plurality of packet switching equipment and a plurality of subscriber terminals accommodated in the packet switching equipment. In the call disconnection method, when a calling terminal that has made a call setup request requests disconnection during a call setup state, the calling terminal is accommodated after receiving a connection completion signal in response to the call setup request. The packet switch performs call disconnection processing.

The present invention also provides that in a packet switching system having a plurality of packet processing units and a plurality of subscriber terminals housed in the packet processing unit, a call disconnection method in the packet switching system is such that when a call is being set up, When a call disconnection request is made by the calling terminal that made the request, the packet processing unit accommodating the calling terminal performs call disconnection processing after receiving a connection completion signal in response to the call setup request.

(Function) According to the present invention, when a call setup request is made from a subscriber terminal, the originating side packet switch that accommodates the calling terminal that made the call setup request sends the request to the destination side switch indicated in the call setup request. A call setup request packet is sent to Then, when the originating exchange receives a call disconnection request from the calling terminal while the call is being set up, the originating exchange performs call disconnection processing after receiving the connection completion packet for the 11.P establishment request packet. Do this.

Further, according to the present invention, when a call setup request is made from a subscriber terminal, the calling side packet processing unit accommodating the calling terminal that has made the call setup request processes the called side packet indicated in the call setup request. A call setup request packet is sent to the unit. Then, when the originating packet processing unit receives a call disconnection request from the calling terminal while the call is being set up, the originating packet processing unit receives the connection completion packet in response to the call setup request packet, and then terminates the call. Perform cutting process.

(Embodiment) Next, an actual example of a call disconnection method in a bucket switching network according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, there is shown a 19th embodiment of a relay system diagram in which the call disconnection system according to the present invention is applied to a packet switching network. The packet switching network shown in the figure is formed by a plurality of packet switches 10 and is a switching network capable of providing call transfer services or representative selection services to subscribers.

The packet switch IO is a packet switch to which the call disconnection method in this embodiment is applied, and connects the trunk lines 100 . They are connected by 102 or 104. packet switch lO
Also house each subscriber terminal, which is data terminal equipment. That is, the packet switch 10A connects the subscriber terminal 20 to the packet switch 10 via the subscriber line 200.
B accommodates the subscriber terminal 22 via the subscriber line 210, and the packet switch 10c accommodates the subscriber terminal 24 via the subscriber line 220. In the figure, only one subscriber terminal is accommodated in the packet switch IO, but this is to avoid complicating the diagram, and each packet switch IO is accommodated in one subscriber terminal.
O accommodates a plurality of subscriber terminals.

FIG. 2 shows a call disconnection sequence in this embodiment.An example of the operation in this embodiment will be explained using FIG. 1 and the same figure. When the subscriber terminal and terminal 2B accommodated in the exchange 10A make a call setup request to the subscriber terminal 22 accommodated in the exchange 1011, the exchange 10A sends the exchange I! A call setup request packet requesting connection to the subscribing terminal 22 is sent to the IOB.

When the exchange 10B receives this call setup request packet, it performs call processing on the subscriber terminal 22 via the subscriber line 200. When the subscriber terminal 22 receives the incoming call signal and is in a state where it can respond, it sends an incoming call acceptance to the exchange 10B. When the exchange 10B receives the incoming call acceptance from the subscriber terminal 22, it sends a connection completion packet indicating that the connection with the subscriber terminal 22 has been completed to the exchange 10A.

In this embodiment, as shown at point 3l in FIG. 2, even if the subscriber terminal 20 makes a call disconnection request, the exchange 10A
does not send a call disconnection request packet to the exchange 10B if it is in the call setup state without receiving a connection completion packet. That is, when the subscriber terminal 20 that made the request during call setup makes a call disconnection request, the exchange 10A receives the connection completion packet from the exchange 10B and at the same time disconnects the subscriber terminal. A call disconnection request packet is sent to 22.

When the exchange 10B receives the call disconnection request packet, it instructs the subscriber terminal 22 to disconnect the call. When the exchange 10B receives a disconnection confirmation signal from the subscriber terminal 22, it sends a call disconnection confirmation packet to the exchange 10A. When the exchange 10A receives the call disconnection confirmation packet from the exchange 10B, the exchange 10A transmits it to the subscriber terminal 20.
to terminate the call disconnection sequence.

In this way, in this embodiment, a call disconnection request packet is not sent during call setup. Therefore, the destination exchange does not need to use the calling side link information in the call disconnection request packet to search for and disconnect the call. Therefore, if connection with the subscriber terminal 22 is not possible and the incoming call is transferred to the subscriber terminal 24 of the exchange IOC, for example, it is possible to quickly perform the disconnection process. That is, according to this embodiment, call disconnection processing can be performed regardless of where the incoming call is transferred.

Note that the embodiment described here is one embodiment of the present invention, and the present invention is not particularly limited thereto. That is, in the present invention, the form of forming a packet switching network or the number of packet switching devices is of course not limited to the above-described embodiments. The invention is also applicable to systems that span networks. The present invention is also applicable to a packet switch comprised of a plurality of packet processing units. In this case, the packet switch in the above embodiment corresponds to the packet processing unit: L-nit, and the packet switch network corresponds to the packet switch. By applying the present invention to such a packet switch, it becomes easy to realize a representative selection service in which a group is formed across a plurality of units, or a call transfer service in which an incoming call is transferred between the plurality of units.

(Effects of the Invention) According to the present invention, after detecting a call setup request from a subscriber terminal accommodated in the own network, when the call is in the call setup state, the call is disconnected from the subscriber terminal that made the call setup request. If a request is detected, a connection completion packet is received from the other party, and then a call disconnection request packet is sent to the other party. As a result, the call disconnection process itself using the conventional call search for disconnection is no longer necessary. 'The disconnection process at the T-side packet switch becomes simple, and an increase in overhead can be avoided.

That is, it has the effect of eliminating the limitations on the transfer range of incoming calls in the conventional call transfer in a packet network that performs call disconnection processing due to a call surge and the representative selection service. Therefore, the call disconnection method according to the present invention is extremely effective in a packet switching network that requires a service of forwarding or dropping incoming calls to the extent that the call search method for disconnection cannot achieve.

[Brief explanation of drawings]

FIG. 1 is a relay system diagram of a packet switching network to which an embodiment of the call disconnection method in a packet switching network according to the present invention is applied. FIG. 2 is a sequence diagram showing an example of a call disconnection sequence in the embodiment of FIG. This is a diagram. Explanation of main part symbols

Claims (1)

[Claims] 1. In a packet switching network having a plurality of packet switching equipment and a plurality of subscriber terminals accommodated in the packet switching equipment, the call disconnection method in the packet switching network is as follows: In this case, when a call disconnection request is made by the calling terminal that made the call setup request, the packet switch that accommodates the calling terminal performs call disconnection processing after receiving a connection completion signal in response to the call setup request. A call disconnection method characterized by: 2. In a packet switch having a plurality of packet processing units and a plurality of subscriber terminals housed in the packet processing unit, the call disconnection method in the packet switch is as follows: When a call is being set up, a call setup request is sent. When a call disconnection request is made by the calling terminal that has performed the call setting request, the packet processing unit accommodating the calling terminal performs call disconnection processing after receiving a connection completion signal in response to the call setup request. Call disconnection method.