Patent ID: 11876839
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of selecting a serving session control node in an Internet Protocol, IP, Multimedia Subsystem, IMS, telecommunication network, for a User Equipment, UE, the method comprising:
receiving, by an interrogating session control node, a Session Initiation Protocol, SIP register message for registering the UE in the IMS telecommunication network, the SIP register message comprising a UE capability feature mappable, by a Home Subscriber Server, HSS, to a UE initiated server capability supported by the serving session control node;
transmitting, by the interrogating session control node, to the HSS, a user authorization request message comprising the UE capability feature;
in response to the user authorization request message, receiving, by the interrogating session control node, from the HSS, a user authorization answer message comprising one or more UE initiated server capabilities supported by the serving session control node; and
selecting, by the interrogating session control node, the serving session control node based on the one or more received UE initiated server capabilities in the user authorization answer message.