Tech-invite  3GPPspace  IETFspace
SIP ↠  Examples  Grammars  Presence ⇾  Main  Services  Transaction  Dialog  IMS 
TS 24.228 – §7.2.2 – §7.3.2 – §7.4.2   List   Prev   Next
Top   Up   Prev   Next
IMS S1 signalling flow - Session Initiation: Mobile origination and termination roaming, with different network operators - IMS S1-7f. SIP 180 Ringing response (INVITE): from P-CSCF1 to UE1
  • Record-Route: P-CSCF1 rewrites the Record-Route header to add the comp=sigcomp parameter to its own SIP URI and its port number negotiated during the security agreement.