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IP Multimedia Subsystem

   Also found in: Wikipedia 0.03 sec.

An integrated network for telecommunications carriers that uses the IP protocol as its foundation for packetized voice, video and data. Supporting voice over IP (VoIP) in all its flavors (SIP, H.323, MGCP, etc.), the IP Multimedia Subsystem (IMS) is designed to interface with the PSTN and provide traditional telephony services such as 800 numbers, caller ID and local number portability.

Converged Wireless and Wireline
Part of the 3GPP project, the IMS was conceived to offer full support for every type of communications session in today's world whether over wireless or landline, including instant messaging (IM), push-to-talk, videoconferencing and video-on-demand (VOD). It is the 21st century initiative for carrier networks supporting IP convergence. See 3GPP, VoIP and IP on Everything.
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The move will allow them strengthen their partnership in the IP multimedia subsystem (IMS) business that is expected to grow in future.
Access, Oki Electric to Set up Joint Venture to Develop ... by JCNN News Summaries
MetaSwitch is an industry-leading vendor of IP Multimedia Subsystem (IMS) switching and applications solutions for both packet and circuit-switched networks.
Telebec Benefits from MetaSwitch's Expertise to Offer Digital ... by Business Wire
Tokyo, Japan, July 29, 2005 - (JCNN) - Ericsson and BB Mobile, a Softbank affiliate, jointly completed the world's first test with an IP multimedia subsystem (IMS) between a 3G mobile network and a wireless local area network (WLAN).
Ericsson, BB Mobile Successfully Hand Over IMS Service between 3G and ... by JCNN News Summaries
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