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SIP confirmed Dialog state with SIP 200 OK response from Bob to Alice

U2:

  • confirms the dialog by sending a final response to the INVITE request;
  • sends the 200 response by using the Via header fields (not shown).

P2:

  • forwards the 200 response by using the Via header fields (not shown).

P1:

  • forwards the 200 response by using the Via header fields (not shown).

U1:

  • passes its dialog state to 'confirmed' when receiving the final response to its INVITE request.