JPH02216953A - Service selection system for busy mode of called terminal - Google Patents

Abstract

PURPOSE:To freely select the services via a calling terminal in a busy mode of a called terminal by receiving the service selection information obtained in a busy mode of the called terminal via a user and the user information and offering the service based on the service selection information via the called terminal in the busy mode. CONSTITUTION:When the terminals 11-14 stored in a subscriber's private electronic exchange 1 are called from a terminal 21 via an ISDN network, a called terminal informs the switchboard 1 of the service selection information obtained in a busy mode via a user and the user information which are defined in an I series. Thus the switchboard 1 identifies the state of the called terminal which is designated by a received call setting message and offers the service in a busy mode of the called terminal based on the service selection information designated by the user/user information contained in the call setting message. Thus the service properties are improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to private electronic branch exchanges, and in particular, to CCITT Recommendation I.
This invention relates to a service selection method when a called terminal is busy via a basic interface or a primary group interface based on series.

[Conventional technology]

Conventionally, in non-ISDN networks, between the private electronic branch exchange and the central office exchange, the network is limited to only the information (signals) necessary to connect the calling terminal and the called terminal, such as activation signals and selection signals. There is no way to send information from the calling terminal to the called party's private electronic branch exchange or terminal before the call begins. For this reason, in conventional private electronic branch exchanges, a busy transfer service and an extension representative service are well-known techniques that allow a call to be received by another terminal when the called terminal is busy.

[Problem to be solved by the invention]

As mentioned above, conventionally, there is no way to send information from the calling terminal to the called side's private branch exchange or terminal before the call starts, so if the called terminal is busy on the called side's private branch exchange or terminal, Because the call is received by another predetermined terminal,
There is a problem in that the calling terminal cannot select any service when the called terminal is busy.

[1lIII! [Means for Solving the Problems] The service selection method of the present invention when a called terminal is busy is a private electronic branch exchange connected to an ISDN network through a basic interface and a primary group interface according to the CCITT Recommendation I series, so that a terminal can access the ISDN network from the terminal. When calling a terminal housed in the private electronic branch exchange via the private branch exchange, service selection information when the called terminal is busy is sent to the user terminal defined in the I series.
The user information is used to notify the private branch exchange.

〔Example〕

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

FIG. 1 is a diagram showing a relay system of a private electronic branch exchange in an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a call setting message in the same embodiment.

In Fig. 1, 1 is a private branch exchange (PBX); 11 is a private branch exchange (PBX);
．． 12 is an ISDN m terminal accommodated in the private electronic branch exchange 1 in a multi-point configuration, 13 is an ISDN terminal accommodated in the private electronic branch exchange 1 in a point-to-point configuration, and 14 is an ISDN terminal connected to the private electronic branch exchange l via a terminal adapter (TA). 15 is an interface conversion device (TA) for connecting a non-ISDN terminal to a standard interface, and 21 is an IS to be connected to the ISDN network.
It is a DN terminal.

Referring to both figures, from a terminal (calling terminal) 21 connected to the ISDN network to a private branch exchange 1 connected to the ISDN network, a terminal (called terminal) 11 accommodated in this private branch exchange 1 is connected to the ISDN network. 12. Sends a call setup message to call 13°14.

At this time, the calling terminal 21 sends service selection information to the called terminal 11 in this message, indicating what service you would like to receive when the terminal 14 is busy, based on the CCITT Recommendation I series (1,
451) using the user/user information that has been defined. The private electronic branch exchange 1 identifies the state of the called terminal specified in the received call setup message and, if the called terminal is busy, selects the service selection information specified by the user-to-user information in the call setup message. Provides service when the called terminal is busy. This service includes, for example, the following services:

Camp-on: When the called terminal recovers and is about to die, it calls back to the calling terminal and connects.

Change called terminal: Specify one or more other called terminals and call an empty terminal among them.

Message registration: Messages addressed to the called terminal are stored in the private electronic branch exchange and subsequently sent from the called terminal.

In the above embodiment, the method of specifying the called terminal 11S14 accommodated in the private electronic branch exchange 1 was the subaddress method specified in the I series, but the same method can be used for the direct dial method and the individual call receiving method. can.

〔Effect of the invention〕

As explained above, according to the present invention, from the terminal to the ISD
When calling a terminal housed in a private electronic branch exchange via the N network, the service selection information when the called terminal is busy is sent to the CCIT.
From the calling terminal to the called terminal by using the user information defined in the T Recommendation I series to receive and provide service based on the service selection information I when the called terminal is busy. You can freely select the service you want to use when the phone is busy.

Punishment #ShizuiShizu

[Brief explanation of the drawing]

FIG. 1 and FIG. ta2 are diagrams showing an embodiment of the present invention. 1... Private branch exchange, 11.12, 13.14°21... Terminal. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] In a private electronic branch exchange connected to an ISDN network using a basic interface and a primary group interface according to the CCITT Recommendation I series, when a terminal calls a terminal accommodated in the private branch exchange via the ISON network, the called terminal A service selection method when a called terminal is busy, characterized in that service selection information during a busy time is notified to the private electronic branch exchange using user-to-user information defined in the I series.