A method is provided for facilitating recovery from the failure of a P-CSCF within an IP
multimedia Subsystem network. A gateway, such as a GGSN, monitors signals arriving at the …

(57) ABSTRACT A method and information processing system provide reli ability in an IP
multimedia subsystem network. The method includes monitoring a S-CSCF (210) for its …

A method for restoring connectivity between a node in an IP Multimedia Subsystem, IMS,
network, and a User Equipment, UE. The UE is associated with a Proxy Call Session Control …

The present invention relates to a network using SIP pro tocol, including an IP multimedia
subsystem (IMS) network, and more particularly, the present invention relates to a method of …

A first communication provider supports an IP multimedia subsystem (IMS) having a border
session control function (BGCF) that receives SIP requests. The SIP requests correspond to …

A method of handling SIP session initiation requests in an IP Multimedia Subsystem, IMS,
network. The method is performed at an application server, AS, within the network. The AS …

The present invention relates to a method for deregistration of a UE from an IMS, the
deregistration being initiated from and performed by a P-CSCF node. The present invention …

A method of enabling redundancy for a Home Subscriber Service (HSS) of an IP Multimedia
Subsystem (IMS) is provided. Redundancy is provided by a plurality of HSS instances …

A system, method, and Proxy Call/Session Control Function (P-CSCF) for transporting
signaling connectivity status information relating to a signaling connection between a …

A method and apparatus for maintaining service continuity for User Equipment accessing an
IP Multimedia Subsystem communication network. A routing identifier is established that …