I have a few lines like this at asterisk/messages.
[May 25 15:22:42] WARNING chan_sip.c: Hanging up call
5a2600300339934f704528bb14ed05e9@MyAsterisk:5060 – no reply to our critical packet (see https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions).
Since we have hundreds of clients with hundreds of simultaneous calls, how is it possible to know to which customer/IP those calls refer to?
The above literature don’t say much to help to narrow down the problem scope.