[asterisk-users] One way audio...

[Carlos Chavez]

	I am still having a very frustrating problem win an Avaya-Asterisk
system.  I have written about this before but I am expanding the
description of the problem just in case someone can give me some
insight.

	This installation is an Asterisk 1.4.19.1 server connected to an Avaya
PBX using a PRI E1.  Integration works great and we can dial from any
extension to any extension on both sides.  The problem happens when we
connect a Linksys PAP2T outside the network.  If I dial an extension on
the Avaya from that PAP2T I get one way audio (I can hear them but they
cannot hear me).  This only happens when I dial an extension on the
Avaya.  If I dial to the voicemail extension I can get my messages.  I
can speak to any SIP extension connected to the Asterisk server.

	Here is the strangest part: If they dial the PAP2T from an Ayava
extension everything works great, audio both ways.  In this installation
there are 45 PAP2T and 45 SPA3102 external extensions.  All the SPA3102
extensions do NOT have the problem the PAP2T does.  I always get two way
audio with the SPA3102.  When I do an "rtp debug" I can see that
incoming RTP packets stop the moment the Avaya extension picks up.  If
the PAP2T is connected on the same internal network as the Asterisk then
everything works, only when the PAP2T is outside the network do we get
one way audio.

	The only difference I can find between the configuration of the SPA3102
and the PAP2T is a parameter called "Symmetric RTP" which is enabled on
the SPA but does not exist on the PAP2T.  I do not know if this has
anything to do with the problem but there is nothing else I can find.

	Any recommendations on how to tackle this problem?  Right now the only
solution I can see is to replace all PAP2T with SPA3102 but obviously I
would like to avoid the expense.

-- 
Telecomunicaciones Abiertas de México S.A. de C.V.
Carlos Chávez Prats
Director de Tecnología
+52-55-91169161 ext 2001

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