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paper    

Advanced SIP Series: SIP and 3GPP Operations
The Session Initiation Protocol has been chosen by the 3GPP for establishing multimedia sessions in UMTS Release 5 (R5) networks. This paper discusses the operations of the UMTS R5 IP Multimedia Subsystem (IMS) in great detail. The paper discusses where SIP is used in UMTS IMS and the interaction between the various components of the IMS networks. The changes and enhancements made to the Internet telephony signaling protocols such as...
preview: http://www.awardsolutions.com  

standards    

SIP Center
SIP (Session Initiation Protocol) is a protocol developed to assist in providing advanced telephony services across the Internet. Internet telephony is evolving from its use as a "cheap" (but low quality) way to make international phone calls to a serious business telephony capability. SIP is one of a group of protocols required to ensure that this evolution can occur.
preview: http://www.sipcenter.com  

association    

SIP - Session Initiation Protocol
SIP (Session Initiation Protocol) is emerging as the protocol of choice for setting up conferencing, telephony, multimedia and other types of communication sessions on the Internet. SIP may also be used for new types of communications, such as instant messaging and application level mobility across various networks, including wireless, and across user devices.
preview: http://www.sipforum.org