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128ms
2015 Mar 31
0
How does chan_sip match an ACK?
...s means that the answering system, upon receiving the SIP INVITE,
would reply with a 100 Trying, followed immediately by a 200 OK.
Now, the two systems are actually on opposite sides of the Atlantic,
and the sending system sent the INVITE with a very short retransmission
timeout (T1 appeared to be 228ms due to a qualify time of 114ms). And by
the time it received the replies from the receiving system, it had
already retransmitted the INVITE.
However, the receiving system, having sent the 200 OK, then received
the repeat INVITE. It looks like it repeated the 200 OK, but then the
ACK from the sendi...