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

 

 

 

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IMS R4-1a. SIP SUBSCRIBE request: from P-CSCF1 to I-CSCF1

R4-1a.  SIP SUBSCRIBE request: from P-CSCF1 to I-CSCF1  (2 of 10)