[asterisk-users] Inboud call drops when transfered

[Carlos Chavez]

     We are having a strange problem today.  We have a SIP trunk from a 
provider and incoming calls are being dropped after the IVR when 
attempting to connect to any internal phone.  If a you dial a DID that 
goes directly to a phone you can talk but the call will drop when you 
attempt a transfer.

     The trunk provider tells us that they are dropping the call because 
according to them we are trying to transfer the call out on the trunk 
instead of doing it internally (which I really do not understand how 
that would even be possible).  In the CLI I can see the following error 
when the call drops:

-- Got SIP response 500 "Server Internal Error" back from 
172.XXX.XXX.XXX:5060

     Since that is the IP of the provider I woud assume the problem is 
on their side but they are insisting Asterisk is to blame here. We are 
running Asterisk 11.6-cert10 which has been working fine until today 
with no changes.

-- 
Telecomunicaciones Abiertas de México S.A. de C.V.
Carlos Chávez
+52 (55)9116-91161