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Community Member

Question on codec

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

3 REPLIES

Re: Question on codec

It seems like your call have no dial-peer to match and then default dial-peer is matched (it has g729 in its configuration).

Community Member

Re: Question on codec

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

Super Bronze

Re: Question on codec

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_paper09186a00800c5f67.shtml

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

Is this causing you a problem?

Aaron

Aaron Please remember to rate helpful posts to identify useful responses, and mark 'Answered' if appropriate!
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