ThiS TS is the Stage 2 specification for the security requirements, security architecture, security features
and security mechanisms for the Presence Service, which includes the elements necessary to realise the requirements in TS 22.141
and TS 23.141
. As far as SIP-based procedures are concerned, this specification refers to
. The main content of this specification is the security for the Ut reference point, which is HTTP–based, as
applied in presence services.