JPS63308460A - Transferring system for trunk line incoming call to another trunk line - Google Patents

Abstract

PURPOSE:To automatically evade such state that the recovery of a trunk is impossible, by deciding the permission/no permission of a transfer processing based on data corresponding to both the trunk of a trunk line incoming call and another trunk when the trunk line incoming call is subject to trunk line transferring via another trunk. CONSTITUTION:A central control unit 7 analyzes a dial number, and after deciding the fact that an opponent is a subscriber in an exchange network 5 connected to an outgoing trunk 3, reads out the data representing the presence/absence of a recovery signal with respect to an incoming trunk 2 and the outgoing trunk 3, and decides the permission of connection. In the above decision, when either data represents the presence of the recovery signal, the central control unit 7, after connecting an extension subscriber 6 and the outgoing trunk 3, connects the incoming trunk 2 to the outgoing trunk 3 after the on-hook of the extension subscriber 6. In such a way, when the trunk line incoming call is transferred via another trunk line, it is possible to prevent the automatic recovery infeasible state of the trunk due to transfer from being generated in a case where both exchange networks connected to two trunk lines are not provided with the recovery signals.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for relaying an incoming call from a central office line to another central office line in an automatic branch switching machine, and in particular, to In both cases, the recovery signal is not activated (this case relates to a method of transferring incoming calls from a central office line to another central office line in such a way that relay transfer processing is not performed).

[Conventional 0) Technology] Conventionally, as a method for transferring a call on the central office line layer to outside a private automatic branch exchange via another central office line, there is a method disclosed in Japanese Patent Application Laid-Open No. 61/127266.
The one shown in the publication is known.

If there is data in the outgoing dial memory provided for each of the 22 individual trunks, the central office line outgoing call will be made via the other trunks, and θ will be sent via the private branch exchange.
Individual incoming calls and calls to other station lines are possible.

[Problem that the invention seeks to solve]

However, in the case according to the above-mentioned publication, no consideration is given to the restoration signal ζ of the station line in use. Therefore, if a restoration signal is not sent from the two used office lines after the call ends, both office lines will be automatically restored and will become unusable from then on, resulting in a problem. It becomes.

An object of the present invention is to disallow transfer processing when both the switching network on the receiving side (transfer destination) and the switching network on the transfer source are switching networks that do not have a recovery signal. An object of the present invention is to provide a method for transferring incoming calls from a central office line to another central office line, which can automatically avoid a situation in which trunk recovery is impossible.

[Means for solving problems]

The above purpose is to set in advance data indicating whether or not the switching network connected to all trunks or trunk groups for incoming and outgoing calls has a recovery signal, and to transmit the data to the central office via the private automatic branch exchange. If a transfer request occurs that results in connecting the station line with the station line, the recovery signal presence/absence data of both station lines is determined, and if both data are determined to be absent, the transfer service is disabled. This is achieved by making it permissible.

[Effect]

When a request is made to transfer an incoming call to another central office line, and the transfer destination is another central office line, the two trunks or trunk group ζ that are currently in use and will be used in the future are
Based on the combination of recovery signal presence/absence data of the corresponding destination switching network, it is determined whether or not the transfer process is possible.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained using the relay system shown in FIGS. 1 to 3, respectively.

First, in FIG. 1, when an extension subscriber 6 connected from the switching network 4 via the incoming trunk 2 transfers the incoming call outside the private automatic branch exchange, the extension subscriber 6 In addition to the hookup, a trunk access special number and a subscriber number connected to the switching network 5 are dialed. The central control unit 7 analyzes the dialed number to determine that the other party is a subscriber in the switching network 5 connected to the outgoing trunk 3, and then stores information regarding the incoming trunk 2 and the outgoing trunk 3 from the memory 8. Data indicating the presence or absence of a restoration signal is read out, and then a determination is made as to whether or not the connection is permitted. If at least one of the data indicates the existence of a recovery signal in this judgment, the central control unit 7 connects the extension subscriber 6 and the originating trunk 3, waits for the extension subscriber 6 to go on-hook, and then receives the call. This is where trunk 2 and originating trunk 3 are connected as shown in FIG. However, if it is determined that there is no recovery signal in both the incoming trunk 2 and the outgoing trunk 3 in determining the presence or absence of the recovery signal for both trunks, the central control unit 7 sends the extension subscriber 6 a message as shown in FIG. On the other hand, by connecting the service trunk 9 and transmitting a special sound, it is possible to notify that the transfer request is not accepted.

〔Effect of the invention〕

As explained above, according to the present invention, when an incoming call on a central office line is transferred via another central office line, if the switching networks connected to the two central office lines used do not have recovery signals, This has the effect of preventing a state in which trunk automatic recovery is not possible due to transfer.

[Brief explanation of the drawing]

1, 2, and 3 are diagrams showing a relay system according to the present invention. 1...Switch 2...Incoming trunk, 4
. 6...Outgoing trunk 4.5...Switching network 6...Extension subscriber 7...Central control unit 8...Memory
9...Service Trunk Agent Patent Attorney
Katsutoshi Ogawa − Notification: ′ Figure

Claims (1)

[Claims] 1. In the private automatic branch exchange, all trunks for outgoing and incoming calls are associated in advance with data indicating the presence or absence of a recovery signal for the switching network to which the trunk is connected,
When transferring an incoming call to the central office line via another trunk,
A call received from a central office line to another central office line is characterized in that it is determined whether forwarding processing is permissible or not based on data associated with both trunks, and the forwarding process is performed only when conditions for allowing forwarding are established. Transfer method to.