[Freeswitch-users] Call Drop ( we think only when originated by Mitel phone)

[Sean Devoy]

FreeSWITCH Version 1.8.5-6-31281a0bf1~64bit (-6-31281a0bf1 64bit)
The server is offsite and not NATed, the phones are NATed.

My customer got some Mitel 6867i phones.  They are working fine 95% of the time.  We have narrowed it down we think but this may be anecdotal based on limited data.  It appears to only happen when a call is originated from these Mitel phones.  Cisco phones at the same site are rock solid.  The customer reports "dropped calls".  I got a Mitel 6867i and tested.

After 44 test calls, I got a dropped call within seconds of being answered.  Another instance where user actually gave me enough information to track it down showed the exact same thing - hangup after 7 seconds.

Here is a log extract at the point where I answer the test call.  sofia/external/4104440002 is the Mitel originating phone.
15:52:04.041308 [NOTICE] sofia.c:8429 Channel [sofia/internal/314] has been answered
15:52:04.041308 [DEBUG] switch_channel.c:3781 (sofia/internal/314) Callstate Change EARLY -> ACTIVE
15:52:04.041308 [DEBUG] switch_core_codec.c:248 sofia/external/4104440002 at 66.241.96.237 Restore previous codec PCMU:0.
15:52:04.041308 [DEBUG] switch_ivr_originate.c:3798 Originate Resulted in Success: [sofia/internal/314]
15:52:04.041308 [DEBUG] switch_channel.c:2047 (sofia/external/4104440002 at 66.241.96.237) Callstate Change RING_WAIT -> ACTIVE
15:52:04.041308 [DEBUG] switch_ivr_bridge.c:1782 (sofia/internal/314) State Change CS_CONSUME_MEDIA -> CS_EXCHANGE_MEDIA
15:52:04.041308 [DEBUG] switch_core_state_machine.c:584 (sofia/internal/314) Running State Change CS_EXCHANGE_MEDIA (Cur 4 Tot 1109)
15:52:04.041308 [DEBUG] switch_core_state_machine.c:653 (sofia/internal/314) State EXCHANGE_MEDIA
15:52:04.041308 [DEBUG] mod_sofia.c:646 SOFIA EXCHANGE_MEDIA
15:52:04.101306 [DEBUG] switch_rtp.c:7550 Correct audio ip/port confirmed.
15:52:07.501320 [NOTICE] sofia.c:1079 Hangup sofia/external/4104440002 at 66.241.96.237 [CS_EXECUTE] [NORMAL_CLEARING]
15:52:07.501320 [DEBUG] switch_ivr_bridge.c:917 BRIDGE THREAD DONE [sofia/external/4104440002 at 66.241.96.237]
15:52:07.521295 [DEBUG] switch_ivr_bridge.c:825 sofia/external/4104440002 at 66.241.96.237 ending bridge by request from write function
15:52:07.521295 [DEBUG] switch_ivr_bridge.c:917 BRIDGE THREAD DONE [sofia/internal/314]
15:52:07.521295 [NOTICE] switch_ivr_bridge.c:1034 Hangup sofia/internal/314 [CS_EXCHANGE_MEDIA] [NORMAL_CLEARING]
15:52:07.521295 [DEBUG] switch_core_state_machine.c:653 (sofia/internal/314) State EXCHANGE_MEDIA going to sleep
15:52:07.521295 [DEBUG] switch_core_state_machine.c:584 (sofia/internal/314) Running State Change CS_HANGUP (Cur 4 Tot 1109)
15:52:07.521295 [DEBUG] switch_core_state_machine.c:847 (sofia/internal/314) Callstate Change ACTIVE -> HANGUP
15:52:07.521295 [DEBUG] switch_ivr_bridge.c:1881 sofia/internal/314 skip receive message [UNBRIDGE] (channel is hungup already)
15:52:07.521295 [DEBUG] switch_ivr_bridge.c:1884 sofia/external/4104440002 at 66.241.96.237 skip receive message [UNBRIDGE] (channel is hungup already)
15:52:07.521295 [DEBUG] switch_core_state_machine.c:849 (sofia/internal/314) State HANGUP
15:52:07.521295 [DEBUG] mod_sofia.c:443 sofia/internal/314 Overriding SIP cause 480 with 200 from the other leg
15:52:07.521295 [DEBUG] mod_sofia.c:449 Channel sofia/internal/314 hanging up, cause: NORMAL_CLEARING
15:52:07.521295 [DEBUG] switch_core_session.c:2887 sofia/external/4104440002 at 66.241.96.237 skip receive message [APPLICATION_EXEC_COMPLETE] (channel is hungup already)
15:52:07.521295 [DEBUG] switch_core_session.c:2887 sofia/external/4104440002 at 66.241.96.237 skip receive message [APPLICATION_EXEC_COMPLETE] (channel is hungup already)

Any ideas why this is happening?
Anyone know any secrets about Mitel phones other then use TCP instead of UDP?
Any ideas on how to debug this further since it happens so rarely?

Thanks,
Sean
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