[Freeswitch-users] IVR codec issue (I think)

[Sean Devoy]

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 at lists.freeswitch.org [mailto:freeswitch-users-bounces at 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 at gmail.com<mailto:ian.mcmaster at 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 at bizfocused.com<mailto:sdevoy at bizfocused.com>> wrote:
[cid:image001.gif at 01CF7533.E75C4700]
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

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--
Guillermo Ruiz Camauer
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