Hi Guillermo,

Thank you for your response.  I wish understood more, but let me tell what I know and ask you another question.

My (voice) ISP only supports “ULaw, ALaw, GSM and G729a”

My phones are all Cisco504G’s.  They support “G711u, G711a, G729a, G722, G726-16 (-24, -24 and -32).  Then there are 2 other items that must be relevant: “DTMF Process AVT: Yes or No” and “DTMF Tx method: Inband, AVT, Info, Auto, Inband + Info, AVT + Info”

I think Tx Method defaulted to AVT+Info as I got warnings about receive DTMF in INFO on FS.  I am set to AVT and DTMF is working fine.

Here is what I think (I would know, but it may not be correct) about codecs:

G711u = ULaw, G711a=ALaw, The phones don’t seem to support GSM (?) and my VISP doesn’t support 722 or any 726. So that leaves me with G711a, G711u, G729.  I have abundant bandwidth everywhere involved.  I know G729 is fairly high quality compression with regard to bandwidth vs audio quality. I also know I have to get a license for each G729 channel on FS for about $10 each.

I do not understand the difference in G711u and G711a.

What is my best choice for DTMF Tx Method?  And codec?

Thank you for your time.

Sean

From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Guillermo Ruiz Camauer
Sent: Wednesday, May 21, 2014 7:53 PM
To: FreeSWITCH Users Help
Subject: Re: [Freeswitch-users] IVR codec issue (I think)

If possible, try to use RFC-2833 for the DTMF and you shouldn't have any codec problems.  711u is only required if you are doing INBAND DTMF.

Guillermo

On Wed, May 21, 2014 at 6:35 PM, Ian McMaster <ian.mcmaster@gmail.com> wrote:

Try:

export data="absolute_codec_string=PCMU"

before the answer in the dialplan.

After answer, the codec is already established.

Ian.

On Wed, May 21, 2014 at 5:22 PM, Sean Devoy <sdevoy@bizfocused.com> wrote:

HI Everybody!

I had a recent problem where a transferred call’s audio was highly degraded.  The cause was identified as mismatched codecs – thanks again.

Today, I have a VERY VERY similar problem.  The difference is that the first step is an IVR, not the receptionist.  How do I set the CODEC for an incoming call to 711u when it is routed to an IVR.

Thanks,

Sean

_________________________________________________________________________
Professional FreeSWITCH Consulting Services:
consulting@freeswitch.org
http://www.freeswitchsolutions.com

FreeSWITCH-powered IP PBX: The CudaTel Communication Server
http://www.cudatel.com

Official FreeSWITCH Sites
http://www.freeswitch.org
http://wiki.freeswitch.org
http://www.cluecon.com

FreeSWITCH-users mailing list
FreeSWITCH-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
http://www.freeswitch.org

_________________________________________________________________________
Professional FreeSWITCH Consulting Services:
consulting@freeswitch.org
http://www.freeswitchsolutions.com

FreeSWITCH-powered IP PBX: The CudaTel Communication Server
http://www.cudatel.com

Official FreeSWITCH Sites
http://www.freeswitch.org
http://wiki.freeswitch.org
http://www.cluecon.com

FreeSWITCH-users mailing list
FreeSWITCH-users@lists.freeswitch.org
http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
http://www.freeswitch.org

--
Guillermo Ruiz Camauer