This TS 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.
full Table of Contents for TS 22.279 Word version: 15.0.0