JPH04160968A - Transfer system for private exchange - Google Patents

Abstract

PURPOSE:To allow a caller only to set extension numbers in advance when the caller wants to talk to a plurality of parties through the extension numbers for saving the caller's burden of transmission operation by providing a relevant private switch system with a means that the caller, when calling a plurality of extension numbers, specifies corresponding extension numbers, and when one of the extension numbers is busy or has no response, calling operation control automatically moves to calling the next extension number sequentially. CONSTITUTION:An ISDN interface means 1, when receiving a call from an relevant ISDN network, sends out reception information to a central control means 2 and also identifies an extension of received subaddress information. The central control means 2, when receiving transfer request information and extension number '301' from the caller, discriminates whether or not the party is busy. If a result of the discrimination indicates vacant, the central control means 2 makes the caller send a call signal to a telephone set 3, and if no response is received within a predetermined period of time, the central control means 2 requests the ISDN network interface means 1 for a number of transfer destination. The interface means 1 sends to the central control means 2 extension number '501' of telephone set 4 in conjunction with information that indicates that the relevant extension number is the last number of transfer request from the caller.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transfer system in a private branch exchange having ink-face means for connecting to an I5DN network.

[Conventional technology]

Conventionally, the forwarding method of private branch exchanges was such that a forwarding destination was set in advance as a fixed or variable destination by the forwarding operation of the receiving party's extension, and when a call arrived at that extension, the forwarding destination was set and forwarded to the extension. .

[Problem to be solved by the invention]

In the conventional forwarding method described above, the receiving party sets a forwarding destination in anticipation of an incoming call while the caller is away, and the forwarding destination is not set as the caller cannot select the forwarding destination at the request of the caller. , or when the transfer destination is unresponsive or busy and the caller requests to talk to multiple extensions, the caller has to make a call again, which is a hassle. Ta.

[Means to solve the problem]

The transfer method of the private branch exchange of the present invention identifies, in the private branch exchange, an ISDN interface means for connecting to the ISDN network and two or more combined extension numbers within the receiving sub-address premises, and first When the phone for the 2nd extension is busy or does not respond to calls for a certain period of time, the 2nd extension, and then the
and central control means for controlling the transfer of incoming calls to the second extension when the call is busy or unanswered.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
FIG. 2 is a diagram showing a destination subaddress for implementing an embodiment of the present invention. The transfer system shown in FIG. 1 consists of an ISDN interface means 1 that controls layers 1 to 3 and transmits and receives information necessary for exchange control between a central control means 28, telephones 3 and 4, and a subscriber port N5. .6 and an exchange switch 7.

Next, the operation will be explained using FIGS. 1 and 2. l
When making and receiving calls using the 5DN network, the extension number information of the other party's private branch exchange is added to the destination subaddress information element. Send and receive two or more extension numbers separated by symbols.

I SDN interface means 1 is SDN#! When an incoming call is received from I, the incoming call information is sent to the central control means 2 and the extension number of the called subaddress information is identified. At this time, if the called sub-address has two or more extension numbers divided by the "#" symbol shown in Figure 2, the center til
Transfer request information indicating that there is a transfer request from the calling side is sent to the J control means 2, and the extension number r301J of the first telephone 3 is sent to the central control means 2. The central control means 2 receives the transfer request information from the calling side and the extension number r301.
When J is received, the state of the subscriber circuit 5, ie, whether it is busy or not, is determined. When the determination result is empty, the subscriber circuit 5 is controlled to send a calling signal to the telephone set 3, and if there is no response for a certain period of time, a transfer destination number is requested from the ISDN network interface means 1.

I In response to the request, the SDN network interface means 1 sends the extension number r501° of the telephone set 4 shown in FIG. is added and sent. In response to this, the central control means 2 determines the state of the subscriber circuit 6,
If it is not busy, a calling signal is sent to the telephone 4 and a response is received. If the caller is busy, a busy tone is sent to the caller via the 15DN interface means 1.

〔Effect of the invention〕

As explained above, the present invention has a means for the caller to specify multiple extensions when making a call, and when one extension is busy or unresponsive, automatically shifts to calling the next extension. , when a caller wants to talk to multiple parties on different extensions, all they have to do is set the extension number of the next party they want to call in advance, and even if the first party they called is busy or does not answer, It is possible to make the first call without having to make a re-call, which has the effect of saving the trouble of making a call.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, and FIG. 2 is a diagram showing a destination sub-address for realizing an embodiment of the present invention. 1...I SDN interface means, 2...Central control means, 3, 4...Telephone, 5, 6...
... Subscriber circuit, 7... Conversion switch.

Claims (1)

[Claims] IS for connecting to the ISDN network in a private branch exchange
The DN interface means identifies two or more combined extension numbers in the received called subaddress, and first, when the telephone set for the first extension number is busy or does not respond to a call for more than a certain period of time, the first extension number is Transfer of a private branch exchange characterized by having central control means for controlling the transfer of incoming calls to a second extension and further to an n-th extension when the call is busy or unanswered, and in which the caller can select and specify the transfer destination. method.