Patent ID: 6978005

Claim:
Method for providing telephone book information in a digital multiple-service network comprising an exchange, a calling subscriber telecommunication terminal connected to the digital multiple-service network via a first ISDN interface, and a called subscriber telecommunication terminal connected to the network via a second ISDN interface, wherein after a call being initiated by a calling subscriber: requesting calling subscriber telephone book information by sending from said called subscriber telecommunication terminal to said exchange a message requesting said calling subscriber telephone book information and comprising the number of said calling subscriber, said request being initiated by said called subscriber, in response to the received message, sending a query for said calling subscriber telephone book information from said exchange to a server implementing a telephone book information service, said server being connected to said multiple-service network via a third ISDN interface, in response to the received query, sending said calling subscriber telephone book information from said server to said exchange, in response to the received calling subscriber telephone book information, sending said calling subscriber telephone book information from said exchange to said called subscriber telecommunication terminal using channels reserved for signaling and a signaling protocol comprising a limited amount of information not belonging to the call.