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IMS Signalling flows (TS 24.228)
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IMS S4 signalling flow - Session Initiation: Mobile origination in home network, Termination in CS network

S4.  Session Initiation
mobile origination in home network
termination in CS network

from:  TS 24.228 – Clause 7.2.3,    Clause 7.3.6,    Clause 7.4.4