8.2. Overview of IMS Standards and Releases
Let’s first take a look at the formal documents specifying the IMS network. IMS was introduced in 3GPP Release 5 (Rel-5) as the standard
multimedia communication system. After its introduction in Rel-5, 3GPP has continually added new functionality to IMS in subsequent releases.
IMS is fully specified in 3GPP technical specifications (TSs). TSs may include reference to standard documents from other standardization organizations. Those other standard documents then become, in full or in part, an integral part of the IMS specification. One prominent example is the reference to IETF RFCs.
Table 8.1 provides an overview of the main 3GPP TSs that specify IMS. Some of these TSs are IMS specific; others also ...
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