Patent ID: 8359015
Filing Date: 2013-01-22
Classification: H04L,H04M

Abstract:
1. A method of providing a call completion service to a not registered or not available user, the service being referred to as CCNReg, the call originating from a first user and terminating at a second user that are both in an IP Multimedia Subsystem (IMS) telecommunication network comprising: a Proxy-Call Session Control Function P-CSCF; an originating Interrogating-Call Session Control Function (I-CSCF), for a first user who is originating a call to a second user; a terminating I-CSCF, for the second user; an originating Serving-Call Session Control Function (S-CSCF), for the first user; a terminating S-CSCF, for the second user; an originating application server, for the first user; a terminating application server, for the second user; and a Home Subscriber Server (HSS); the method comprising: detecting that the second user is not registered or not available; and monitoring the status of the second user;