Least cost routing method according to information transfer capability of customer premises equipment
First Claim
1. A switching system comprising:
- a plurality of ISDN (Integrated Services Digital Network) subscriber line interface circuits each being capable of serving a plurality of customer premises equipment (CPE) of different information transfer capabilities, each of the CPE transmitting a call setup message including, a called party number and an information transfer capability field identifying the CPE when originating a call;
a plurality of ISDN trunk circuits connected to an ISDN network;
switching means for establishing a switched connection between one of the ISDN subscriber line interface circuits and one of said ISDN trunk circuits;
memory means for storing least cost routing data indicating least cost outgoing routes through said ISDN network and digit conversion data corresponding to said least cost outgoing routes; and
control means for receiving a call setup message from an originating CPE through one of the ISDN subscriber line interface circuits, retrieving least cost routing data and digit conversion data from said memory means according to the called party number and information transfer capability field contained in the received call setup message, converting said called party number according to the retrieved digit conversion data, selecting one of said ISDN trunk circuits according to the retrieved least cost routing data, controlling said switching means so that a switched connection is established between said one ISDN subscriber line interface circuit and said selected ISDN trunk circuit, and transmitting the converted called party number through a signaling channel to the ISDN network.
1 Assignment
0 Petitions
Accused Products
Abstract
ISDN subscriber line interface circuits of a switching system serve customer premises equipment of different information transfer capabilities. Least cost routing data and corresponding digit conversion data are stored in a memory, with the routing data indicating least cost outgoing routes through an ISDN network. These data are retrieved from the memory according to the called party number and information transfer capability field of a call setup message received from a calling party. The called party number is then converted according to the retrieved digit conversion data, and an ISDN trunk circuit is selected according to the retrieved least cost routing data. A connection is established between the originating ISDN SLIC and the selected ISDN trunk circuit, and the converted called party number is transmitted through a signaling channel to the ISDN network.
109 Citations
3 Claims
-
1. A switching system comprising:
-
a plurality of ISDN (Integrated Services Digital Network) subscriber line interface circuits each being capable of serving a plurality of customer premises equipment (CPE) of different information transfer capabilities, each of the CPE transmitting a call setup message including, a called party number and an information transfer capability field identifying the CPE when originating a call; a plurality of ISDN trunk circuits connected to an ISDN network; switching means for establishing a switched connection between one of the ISDN subscriber line interface circuits and one of said ISDN trunk circuits; memory means for storing least cost routing data indicating least cost outgoing routes through said ISDN network and digit conversion data corresponding to said least cost outgoing routes; and control means for receiving a call setup message from an originating CPE through one of the ISDN subscriber line interface circuits, retrieving least cost routing data and digit conversion data from said memory means according to the called party number and information transfer capability field contained in the received call setup message, converting said called party number according to the retrieved digit conversion data, selecting one of said ISDN trunk circuits according to the retrieved least cost routing data, controlling said switching means so that a switched connection is established between said one ISDN subscriber line interface circuit and said selected ISDN trunk circuit, and transmitting the converted called party number through a signaling channel to the ISDN network. - View Dependent Claims (2)
-
-
3. In a switching system comprising a plurality of ISDN (Integrated Services Digital Network) subscriber line interface circuits each being capable of serving a plurality of customer premises equipment (CPE) of different information transfer capabilities, each of said CPE transmitting a call setup message including a called party number and an information transfer capability field identifying the CPE when originating a call, and a plurality of ISDN trunk circuits connected to an ISDN network, a method for establishing a least cost route comprising the steps of:
-
a) storing least cost routing data indicating least cost outgoing routes through said ISDN network and digit conversion data corresponding to said least cost outgoing routes in a memory; b) receiving a call setup message from an originating CPE through one of the ISDN subscriber line interface circuits; c) retrieving least cost routing data and digit conversion data from said memory according to the called party number and information transfer capability field contained in the received call setup message; d) converting said called party number according to the retrieved digit conversion data; e) selecting one of said ISDN trunk circuits according to the retrieved least cost routing data; f) establishing a connection between said one ISDN subscriber line interface circuit and said selected ISDN trunk circuit; and g) transmitting the converted called party number through a signalling channel to the ISDN network.
-
Specification