IMS S4-2c. SIP 183 Session Progress response: from S-CSCF1 to P-CSCF1

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IMS S4 signalling flow - Session Initiation: Mobile origination in home network, Termination in CS network - IMS S4-2c. SIP 183 Session Progress response: from S-CSCF1 to P-CSCF1

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