<-- INVITE callid:1347026 audioport = 5246 CSEQ 1 INVITE --> trying --> INVITE callid=174... CSEQ 102 INVITE <-- trying [ wait until remote end answers ] <-- 200 OK as2cbb36ee callid=174... peeraudio = 5214 CSEQ 102 INVITE --> Ack CSEQ 102 ACK --> 200 OK callid:1347026 CSEQ 1 --> (re)INVITE callid=174... SDP: audioport = 5214 CSEQ 103 INVITE [ 4 ms of packet round trip and handling by peer ] <-- ACK (200 ok callid:1347026) CSEQ 1 ACK --> (re)INVITE callid=1347026 SDP: audioport = 5214 CSEQ 102 INVITE [1 sec.] --> (re)INVITE callid=174... SDP: audioport = 5214 CSEQ 103 INVITE [4 ms.] --> (re)INVITE callid=1347026 SDP: audioport = 5214 CSEQ 102 [1 sec.] --> (re)INVITE callid=174... SDP: audioport = 5214 CSEQ 103 INVITE [4 ms.] --> (re)INVITE callid=1347026 SDP: audioport = 5214 CSEQ 102 INVITE [ until hangup ] <-- BYE (callid:1347026) CSEQ 1 BYE --> 200 OK callid:1347026 CSEQ 1 BYE [ remaining time for 1sec. alignment (~800 ms in our test)] --> (re)INVITE callid=174... SDP: audioport = 5214 CSEQ 103 INVITE [4 ms.] --> (re)INVITE callid=1347026 SDP: audioport = 5214 CSEQ 102 INVITE