Patent ID: 6714640
Filing Date: 2004-03-30
Classification: H04M,H04Q

Abstract:
A communication system comprising an exchange and plural ISDN (Integrated Services Digital Network) extension terminals accommodated in the exchange, wherein:said plural ISDN extension terminals are connected to said exchange in a point-multipoint connection mode through an ISDN interface, each of said ISDN extension terminals transmits call-initiation information containing identification information of said ISDN extension terminal when a call is initiated, and said exchange includes: storage means for storing a table representing corresponding relationship between the identification information of said ISDN extension terminal and service class information, and call processing means for searching the table to obtain service class information corresponding to the identification information of said ISDN extension terminal contained in the call-initiation information when the call-initiation information is received from said ISDN extension terminal via said ISDN interface, and performing call processing in accordance with the service class information obtained from the table.