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IMS R4 Registration signalling flow - P-CSCF subscription for registration state event package - sequence chart for IMS R4-2. SIP 200 OK response
  • S-CSCF1 first authorizes the subscription. As S-CSCF1 can trust the content of the P-Asserted-Identity header and <sip:pcscf1.visited1.net> is on the list of the authorized users for the "reg" event package stored by S-CSCF1, therefore S-CSCF1 sends an acknowledgement towards I-CSCF1 indicating that the subscription was successful.