Tech-invite3GPPspaceIETFspace
SIP ↠  ExamplesGrammarsPresence ⇾  MainServicesTransactionDialogIMS
TS 24.228§6.2   List   None   Next
Top   Up   Prev   Next
IMS R1 signalling flow - Registration: User not registered - IMS R1-2b. SIP 401 Unauthorized response: from I-CSCF1 to P-CSCF1