[asterisk-users] inband DTMF for g729

[Julio Arruda]

Gang Chen wrote:
> ----- Original Message ----- 
> From: "Kristian Kielhofner" <kristian.kielhofner at gmail.com>
> To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
> <asterisk-users at lists.digium.com>
> Sent: Friday, June 22, 2007 4:32 PM
> Subject: Re: [asterisk-users] inband DTMF for g729
> 
> 
>> On 6/22/07, Gary Chen <gang.chen at insightbb.com> wrote:
>>> We are using Level 3. At this point, changing carrier is not an option.
>>>
>> Gary,
>>
>>  I use Level(3) with G729a and RFC2833.  No problems, no requirement
>> for inband G729.
>>
>>
>> -- 
>> Kristian Kielhofner
>>
> 
> I can connect to Asterisk IVR using a SIP phone and send RFC2833 with g729. 
> It works fine. But when test call from PSTN to Asterisk, if I set dtmf=auto 
> with g729, I got warning saying something like  * does not support inband 
> for g729 and sutomaticlly switch to rfc2833.  If I set dtmf=g729, there is 
> no warning but I have the same problem. This tells me that Level3 does use 
> inband for g729 or maybe I am doing something wrong .


Have you captured the SDPs ? Or even the RTP traffic (if they are doing 
inband, it would show in the RTP stream). And have you tried 
dtmf=rfc2833 ? (not sure what dtmf=g729 does quite frankly).