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R4.  IMS Registration signalling flow —
P-CSCF subscription for registration state event package

 

 

 

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IMS R4-4a. SIP 200 OK response: from P-CSCF1 to S-CSCF1

R4-4a.  SIP 200 OK response: from P-CSCF1 to S-CSCF1  (10 of 10)