[asterisk-users] Local channel sometimes have no audio

[Carlos Chavez]

     We recently upgraded a very old server from Asterisk 1.8 to 18.9 
and we are having a strange issue with calls in queues.  We use 
Queuemetrics to manage our agents and extensions are configured as 
Local/XXXX at from-queue/n to connect clients to agents.  This is because 
if you dial PJSIP/XXXX directly it will only call the first registered 
device for that extension and not all of them.  The problem we are 
facing is that sometimes there is no audio on the call coming from the 
queues.  Most of the time everything is fine and it is very random when 
audio does not flow.  I have tried to debug SIP but I do not see 
anything wrong and audio should be flowing, it can take a long time 
between failures so it is very difficult to catch the correct call.

     I have another pbx using the same setup with Asterisk and 
Queuemetrics, only difference is that it uses Asterisk 18.5 and we do 
not have any problems with audio there.  As far as I know only calls 
from the queues have this issue, direct calls to the extensions or 
outgoing calls do not.  Could this be an issue with the Local channel?  
I use the /n because that is the example published in the Queuemetrics 
documentation.  I do not know if removing it will affect the call.  Any 
recommendations to properly debug this issue?

-- 
Telecomunicaciones Abiertas de México S.A. de C.V.
Carlos Chávez
+52 (55)8116-9161