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SIP ↠  ExamplesGrammarsPresence ⇾  MainServicesTransactionDialogIMS
TS 24.228§7.2.3§7.3.5§7.4.3   List   Prev   Next
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IMS S2 signalling flow - Session Initiation: mobile origination and termination in home network - sequence chart for IMS S2-1. SIP INVITE request (UE1 to UE2)
  • UE1 is located in the home network, and determines the P-CSCF via the CSCF discovery procedure.
  • P-CSCF1 knows the name/address of the S-CSCF from a prior Registration performed by UE1.