Hi,
We have a custom Linphone client (belle-sip/1.2.1) running on iOS6 connected to an Asterisk 11.8.1 server and are having some issues.
Fairly often, the Linphone client ignores the SDP messages from Asterisk and doesn't send an ACK back. This causes Asterisk to close the connection (which Linphone replies back with a 481
The Linphone logs indicate the packets are being received. The difference I can see with the failed calls is that it seems consistent that the Asterisk box retransmits the 401 once but both are prior to the Linephone's successful INVITE.
I'm attaching some log files and a ladder diagram showing the problem. The first and the third call show the issue whereas the second call worked successfully.
Any ideas on what the problem might be?
Thanks!
+david
linphone_ladder.txt