US8363640B2 - Methods and apparatus for handling a communication session for an
unregistered internet protocol multimedia subsystem (IMS) device - Google Patents …

Apparatuses and methods for enabling IMS services for non-IMS UEs via a home base
station subsystem are described. In various embodiments, a home base station subsystem …

A method of controlling user access to contact information associated with public user
identities (IMPUs) registered in respect of the user's subscription within an IP Multimedia …

Methods, systems, and computer readable media for verifying the identity of a SIP user
seeking to establish a session are disclosed. Methods for verifying the identity of a SIP user …

According to an aspect of the invention, there is provided a method in an IP multimedia
subsystem, IMS, of a tele-communications network. The loss of a secure association …

A user device registers with a proxy-call session control function device (P-CSCF)
associated with an Internet protocol (IP) multimedia subsystem (IMS). The user device …

A user device registers with a proxy-call session control function device (P-CSCF)
associated with an Internet protocol (IP) multimedia subsystem (IMS). The user device …

US9065837B2 - Method, system and network nodes for performing a SIP transaction in a
session initiation protocol based communications network - Google Patents US9065837B2 …

Methods, systems and network nodes for performing a SIP transaction are provided. In one
exemplary embodiment, a method, performed by a second node of sending a Session …

A method and equipment for deregistering a wireless IP access network contact address are
provided. When a call corresponding to a common subscriber ID of a TE is received after the …