(57) ABSTRACT The Instant Messaging capability of an IP multimedia sub system is utilized
to support call transfer service for VoIP users. A call transfer request from a first VoIP user to …

The present invention provides a method and system for providing a SIP based Instance
Messaging (IM), and an IM proxy server therefor. An IM proxy server for performing a proxy …

Provided is a system and method for providing a converged messaging service, which can
be compatibly used with or replace various services, such as an Instant Messaging (IM) …

US20040103157A1 - Store-and-forward server and method for storing and forwarding for
instant messaging service implemented in IP multimedia core network subsystem (IMS) …

Abstract A SIP Gateway (SIPGW) coupled to an IP Multimedia Subsystem (IMS) is disclosed
that detects when a first party, using a Plain Ordinary Telephone Service (POTS) telephone …

A telecommunications system according to an embodiment of the present invention includes
an instant messaging (IM) server (106) and a VoIP server (110); and a plurality of system …

An apparatus and method routes a message via an IP Multimedia core Network Subsystem
(IMS) system is disclosed. A message is received at an Interrogating Call Session Control …

BACKGROUND The present invention relates to communication systems. More particularly,
and not by Way of limitation, the invention is directed to a system and method for providing …

The disclosure provides a method for supporting multiple time zones in an IP Multimedia
Subsystem (IMS). The method comprises: a Proxy Call Session Control Function (PCSCF) …

A method of initiating an IP Multimedia Sub-system communication for a user that is not
registered a priori with the IP Multimedia Subsystem. The method comprises receiving a …