TAILIEUCHUNG - Chapter 5 - Session Control in the IMS

We saw in Section how SIP is used in a public Internet environment. We have also explored the core SIP functionality and a few important extensions that SIP User Agents may support. Each implementation of SIP is free to implement the options or SIP extensions that the particular application requires. 3GPP is one of those particular applications of SIP where SIP is used in a wireless environment. | Chapter 5 Session Control in the IMS We saw in Section how SIP is used in a public Internet environment. We have also explored the core SIP functionality and a few important extensions that SIP User Agents may support. Each implementation of SIP is free to implement the options or SIP extensions that the particular application requires. 3GPP is one of those particular applications of SIP where SIP is used in a wireless environment. In the case of 3GPP SIP is used over an underlying packet network that defines a number of constraints. The result of the evaluation of SIP in wireless environments led to the definition of a set of requirements that accommodates SIP in 3GPP networks. The implementation of solutions to these wireless requirements led 3GPP to mandate the use of a number of options and extensions to SIP and other protocols. We can consider 3GPP s function as creating a profile of utilization of SIP and other protocols in the IP Multimedia Subsystem. The 3GPP SIP profile utilization for IMS is specified in 3GPP TS 37 . We call it a profile because there are no differences with respect to the usage of SIP on the public Internet. However 3GPP has mandated the implementation of a number of extensions and options in both the IMS network nodes and IMS terminals. This section focuses on describing how SIP is used in the IMS as well as highlighting differences in the utilization of SIP with respect to the public Internet. When 3GPP began the work on session control for the IMS SIP was chosen as the protocol to control sessions. At that time the IETF Internet Engineering Task Force was working on a revision of SIP that led to the migration and extension of the protocol from RFC 2543 161 to RFC 3261 286 and other RFCs. Previously the performance of SIP in wireless environments had never been evaluated. Wireless environments have a number of strict requirements for session control protocols like SIP. These requirements range from extra security .

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