Electronic switching system for use in connection to an ISDN and method of setting communication disconnection reasons
AssigneeKabushiki Kaisha Toshiba
InventorHitoshi Katoh
Life of this patent
Estimating the term…
Abstract
An electronic switching system having ISDN interfaces on the extension side stores in a table the attributes of a terminal under communication using the ISDN interface. When there is another incoming call to the ISDN interface, the system waits for a response to the incoming call by the terminals connected to the ISDN. When no response is received, the switching system creates a disconnection reason message on the basis of the result of checking the terminal attributes in the table against the attributes of the incoming call. This disconnection reason message is then communicated to the calling terminal.
Claims11
An electronic switching system comprising:
- an ISDN interface accommodating a plurality of ISDN terminals provided at an extension side of the switching system and including a plurality of channels;
- means for extracting an attribute of a first originating terminal originating a call when a first ISDN terminal originates or receives the call using one of the plurality of channels of the ISDN interface;
- means for storing the attribute of the first ISDN terminal corresponding to a used channel when the first ISDN terminal is engaged in communications with another party following the originating or receiving of the call;
- means for determining whether any of the terminals accommodated by the ISDN interface can respond to and be connected to an incoming call originated by a second originating terminal through an office line;
- means for creating a disconnection reason message for notifying the second originating terminal to discontinue calling based on the attribute of the second originating terminal and the attributes of terminals engaged in communications stored in the storing means, when the determining means determines that none of the terminals accommodated in the ISDN interface can respond and be connected to the call originated by the second originating terminal through the office line;
- and
- means for informing the second originating terminal of the disconnection reason message created by the disconnection reason creating means.
A method of setting a disconnection reason in an electronic switching system including an ISDN interface accommodating a plurality of ISDN terminals provided at an extension side of the switching system and having a plurality of channels, comprising the steps of:
- extracting an attribute of a first originating terminal originating a call when a first ISDN terminal accommodated by the ISDN interface originates or receives the call using one of the plurality of channels of the ISDN interface;
- storing the attribute of the first ISDN terminal corresponding to the used channel when the first ISDN terminal is engaged in communications with another party after the originating or receiving of the call;
- determining whether any of the terminals accommodated in the ISDN interface can respond to and be connected to an incoming call originated by a second originating terminal through an office line;
- creating a disconnection reason message for notifying the second originating terminal to discontinue calling based on the attribute of the second originating terminal and the stored attributes of terminals engaged in communications when the determining step determines that none of the ISDN terminals accommodated by the ISDN interface can respond to and be connected to the call by the second originating terminal;
- and
- informing the second originating terminal of the disconnection reason message created by the disconnection reason creating steps.
Dependencies are inferred from the claim text.