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ETSI TS 122 279
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ETSI TS 122 279 Universal Mobile Telecommunications System (UMTS); LTE; Combined Circuit Switched (CS) and IP Multimedia Subsystem (IMS) sessions; Stage 1 (3GPP TS 22.279 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 03/01/2017
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ETSI TS 122 279 specifies service requirements for Combining CS and IMS services using a CS speech or CS multimedia call in association with an IMS session. The IMS session may consist of one or more IMS services.Requirements for the following capabilities are included:Radio capability exchange.Terminal capability exchange.E.164 number exchange.Adding IMS session to an ongoing CS call.Adding a CS call to an ongoing IMS session.Supplementary services as they relate to CSICS.It is intended that the capabilities defined herein for CSICS shall support interoperability between different operator networks, and roaming.