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call manger voice hearing problem

Unanswered Question
Jun 15th, 2009
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hi friends

i am having one call manager in UK.

and i send some phones to other branches in other countries,in one particular site the phone is register with the call manager,

when i am trying to call other extension it is ringing and if somebody pick the call nothing hearing .

plz give me the solution


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gogasca Mon, 06/15/2009 - 23:14
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Hi Zeus,

If phone registers but not audio it may be a routing problem.

Check routing between IP Phones involved in a call, check NAT, FW, VPN, connections, VLAN.

should be ip connectivity bewteen endpoints.

zeuscyril Wed, 06/17/2009 - 21:36
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hi gogasca,

in my phone the default gateway showing as local lan default gateway ,

but in that place we need to put voice gateway ip or lan gateway is ok

Nicholas Matthews Thu, 06/18/2009 - 15:45
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  • Red, 2250 points or more

While your description of the problem leaves much to be desired in terms of information we need to help you, here's something anyways:

There has been a recent hot bug regarding MGCP with G.729br8 and no way/ one way audio.

Try entering these commands on the MGCP gateway you're dialing into:

mgcp behavior g729-variants static-pt

mgcp behavior dynamically-change-codec-pt disable

or better yet,

Go into your service parameters, and change "Strip G.729 annex b" to TRUE.



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