Something

Server 1:
[Jun 19 16:01:22] DEBUG[11319] chan_iax2.c: Received iseqno 11 not within window 13->13
[Jun 19 16:06:12] DEBUG[11318] chan_iax2.c: Received iseqno 98 not within window 100->100
[Jun 19 16:06:12] DEBUG[11316] chan_iax2.c: Received iseqno 99 not within window 100->100
[Jun 19 16:11:22] DEBUG[11315] chan_iax2.c: Received iseqno 192 not within window 193->193
[Jun 19 16:11:42] DEBUG[11311] jitterbuf.c: Attempting to exceed Jitterbuf max 1000 timeslots
[Jun 19 16:12:02] DEBUG[15145] chan_iax2.c: We're hanging up IAX2/ba-out-3 now...
[Jun 19 16:12:02] DEBUG[15145] chan_zap.c: Set option AUDIO MODE, value: ON(1) on Zap/15-1
[Jun 19 16:12:02] DEBUG[15145] chan_zap.c: Not yet hungup...  Calling hangup once with icause, and clearing call
[Jun 19 16:12:02] DEBUG[15145] chan_zap.c: Set option AUDIO MODE, value: OFF(0) on Zap/15-1

[Jun 19 16:12:02] VERBOSE[11322] logger.c:     -- Channel 0/15, span 1 got hangup request
[Jun 19 16:12:02] VERBOSE[15145] logger.c:     -- Hungup 'IAX2/ba-out-3'

Server 2:
[Jun 19 10:12:03] DEBUG[7949] chan_iax2.c: Immediately destroying 3, having received hangup
[Jun 19 10:12:03] DEBUG[11112] chan_iax2.c: We're hanging up IAX2/ba-out-3 now...
[Jun 19 10:12:03] DEBUG[11112] chan_iax2.c: Really destroying IAX2/ba-out-3 now...
[Jun 19 10:12:03] DEBUG[7941] chan_iax2.c: Raw Hangup 213.159.0.47:4569, src=3, dst=3

[Jun 19 10:12:03] VERBOSE[11112] logger.c:   == Spawn extension (macro-novm, s, 1) exited non-zero on 'IAX2/ba-out-3' in macro 'novm'
[Jun 19 10:12:03] VERBOSE[11112] logger.c:   == Spawn extension (macro-novm, s, 1) exited non-zero on 'IAX2/ba-out-3'
[Jun 19 10:12:03] VERBOSE[11112] logger.c:     -- Hungup 'IAX2/ba-out-3'