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Question on codec

Unanswered Question
Mar 29th, 2010
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Hi,


Would like to know the following,


When intially the call has set up, by default from the pabx travel via to the router gateway (by isdn or e&m trunk) is it in codec G.711 ?


Have done a monitor on our router gateway it shows as follow



0/1/1:15.1      g711ulaw   n  S_SETUP_INDICATED     S_TSP_INCALL

Only when the call going into the router gateway after going through the configuration it shows as follow

0/1/1:15.1      g729r8     n  S_ALERTING            S_TSP_INCALL

Is there anyway to configure in such that the set up will be g729 instead in the router gateway setting ?

Thank you
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Volodymyr Morskyy Mon, 03/29/2010 - 11:09
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It seems like your call have no dial-peer to match and then default dial-peer is matched (it has g729 in its configuration).

alanhow2007 Mon, 03/29/2010 - 19:01
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Dial-peer has been set right as follow


voice class codec 1
codec preference 1 g729r8
!

!

dial-peer voice 2002 voip
translation-profile outgoing Append8
preference 3
destination-pattern .T
progress_ind setup enable 3
progress_ind progress enable 8
translate-outgoing calling 2
session target ipv4:x.x.x.x
incoming called-number .T
dtmf-relay h245-alphanumeric
voice-class codec 1
fax rate 7200 bytes 48
ip qos dscp af21 signaling
no vad

Aaron Harrison Tue, 03/30/2010 - 01:55
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Hi


Presumably the router is assuming G711 prior to the codec negotiation... similar to the way that it works when you run a call through a GK:


http://www.cisco.com/en/US/tech/tk1077/technologies_white_paper09186a008...


Initially it uses G711 bandwidth, and then negotiates whatever the low bit rate codec is.


Is this causing you a problem?


Aaron

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