Using G.729 Prompt on a b-acd script

Unanswered Question
Jul 29th, 2008


My problem is this one:

On a Cisco H323 gateway, I receive calls with G729 Codec from a VOIP Operator. I have a tcl script like an b-acd script for this incomings calls. The problem is that the audio prompt are encoding as G711ulaw, so I can't hear nothing of this prompts.

I have try to translate this prompt to G729 with the Call Manager, but the gateway refused to charge this prompts.

Is it possible to use G729 on the Gateway? Or i have the obligation to use transcoding? In this case, someone can explain me how to do it?

Thanks very much for your help

Baptiste Croizer

I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Ayodeji oladipo... Tue, 07/29/2008 - 04:57

WIth H.323 gateway you dont need a xcoder.

Try this,

conf t

voice class codec 1

codec preference 1 g711ulaw

codec preference 2 g729r8

then apply the voice class on the apriopriate dial-peer


dial-peer voice 100 voip

description *** uk-cucm-sub ***

preference 1

destination-pattern 10..

progress_ind setup enable 3

progress_ind progress enable 8

voice-class codec 1


baptiste.croizer Tue, 07/29/2008 - 05:14


But my problem is that I receive the Call as G729, and I don't want to change this.

But the problem is that I can't hear the audio prompt who are on the Gw, because there are encoding with G711

So on the incoming dial-peer, I have configured G729 Codec, because If I use G711, I can hear the prompt, but next the transfer is not working

xamkookmax Thu, 10/16/2008 - 01:09

Hi, i'm solved this problem.

I take pre-recorded audio file in g729 codec format.

It`s work for all situation, if call comming from PSTN or VoIP.

If you wish know more write me mmv(dog)

pbarman Wed, 11/05/2008 - 18:55

i tried doing this by translating the audio file in CUCM to g729a, and the router gave me an error. I am wondering how you accomplished this. The error I get is:

LA_CUBE_2851#audio-prompt load flash:en_BranchOfficeTCL.g729.wav

Reload of flash:en_BranchOfficeTCL.g729.wav status failed

audio-prompt flash:en_BranchOfficeTCL.g729.wav not loaded - open (or format) failure


*Nov 6 02:52:31.553: %IVR_MSB-3-NOPROMPT: Could not create IVR prompt


errno=0=Unsupported codec type


This Discussion