back to
RFC 3261
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.