Patent ID: 8499340

Claim:
A method of providing secure communication session set-up between a user of a UE (user equipment) associated with a home domain configured according to an IMS (IP (Internet Protocol) Multimedia System) architecture and a third party service that is not associated with the home domain, the method comprising: receiving, in an identity server associated with the home domain, a control message relating to the secure communication session; determining that an identity translation of the control message is necessary; performing the identity translation of the control message by: removing, if a control message target is an entity associated with the third party service, a user identifier identifying the user of the UE and adding a domain identifier identifying the home domain of the UE such that an identity of the user of the UE will be masked from the third party service; and removing, if the control message target is the UE, a domain identifier identifying the home domain of the UE and adding a user identifier identifying the user of the UE; adding an identity token to the control message; and sending the identity translated control message to the control message target.