Patent ID: 9363319
Filing Date: 2016-06-07
CPC Classification: H04L,H04W

Claim Text:
1. A method performed by a User Agent (UA) of registering in an Internet Protocol Multimedia Subsystem (IMS) communications network, the UA using a Proxy Call Session Control Function (P-CSCF) entity with a Serving Call Session Control Function (S-CSCF) entity, the method comprising: determining, by the UA, a first group identifier associated with a plurality of P-CSCF entities; selecting, by the UA and based on the first group identifier, a network address corresponding to one of the plurality of P-CSCF entities; sending, by the UA, to the selected P-CSCF entity using the network address, a message to register with each of the plurality of P-CSCF entities associated with the first group identifier; and establishing, by the UA, a session initiation protocol (SIP) session through a different one of the plurality of P-CSCF entities associated with the first group identifier.