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:
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Radio capability exchange.
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Terminal capability exchange.
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E.164 number exchange.
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Adding IMS session to an ongoing CS call.
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Adding a CS call to an ongoing IMS session.
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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.
