Apparatuses and methods are disclosed for P-CSCF restoration. In one START
embodiment, a method includes receiving a P-CSCF restoration message, the P-CSCF …

Various exemplary embodiments relate to a method performed by a network node for
generating a S9 session ID, the method including: receiving, at the network node, an …

Ltd.(57) ABSTRACT Embodiments of the present invention provide a method, an apparatus,
and a system for processing an eMPS in a CSFB mechanism. The method in the …

Methods and apparatuses related to a P-CSCF server, UE, and PCRF server are disclosed.
An indication may be obtained that the UE is at least dual-registered with an IMS via at least …

The present invention faces the issue of UE enabled to communicate with an IP Multimedia
Subsystem following protocol versions older than Release 9, and provides for an alternative …

A method of facilitating P-CSCF restoration when a P-CSCF failure has occurred is
disclosed. The method comprises a Proxy Call Session Control Function,'P-CSCF'receiving …

Methods and apparatuses are provided that prevent a user equipment (UE) from entering
into a permanent out of service (OOS) state. The UE receives a registration reject message …

In some example embodiments, there may be provided a method that includes forming, by a
user equipment, a session establishment message including an indication of at least one …

In some example embodiments, there may be provided a method that includes receiving, at
a user equipment while being served by a first system and during protocol data unit session …

The present disclosure describes a method and an apparatus for managing security mode
command (SMC) integrity failures at a user equipment (UE). For example, a method is …