[VoIP] DTMF question

[John Novack]

Others may know more, but I believe Asterisk doesn't play well with 
inband DTMF
For that you need a real switch!

John Novack


Jayson Smith wrote:
> Hi,
> This isn't what I want. I think it'd be cool to use actual inband DTMF. Such
> that, when I hit a button, the other end of the call can hear the tone for
> as long as I keep it held down, and any imperfections, etc. That's what's
> inband DTMF is supposed to be, right? Where no digital translation happens,
> and the two ends of the call just send DTMF directly to each other?
> Thanks.
>
> ----- Original Message ----- 
> From: "John Novack" <jnovack at stromberg-carlson.org>
> To: "Jayson Smith" <ratguy at bellsouth.net>; "Voice Over IP Tandem for Analog
> Switches" <voip at ckts.info>
> Sent: Tuesday, April 03, 2007 2:25 PM
> Subject: Re: [VoIP] DTMF question
>
>
>   
>> I use:
>> dtmfmode=rfc2833
>> for my SIP devices, and have no problem
>> I do believe that is the suggested mode for use with Asterisk, and may
>> solve your DTMF problem
>>
>> John Novack
>>
>>
>> Jayson Smith wrote:
>>     
>>> Hi all,
>>> Got a puzzling one for you guys. I recently got three Sipura SPA-2000
>>>       
> units,
>   
>>> and am using one, and like it. Just for the heck of it, I set
>>> dtmfmode=inband for both lines in sip.conf, and have both lines set for
>>> inband DTMF in the SPA. Still, calling one line from the other via my
>>> Asterisk system, when I hit a touchtone on either phone, the other gets
>>>       
> a
>   
>>> tiny blip of the original tone, then, once I let up on the button, a
>>> regenerated, fixed-duration touchtone is heard. In other words, as far
>>>       
> as I
>   
>>> can tell, inband DTMF isn't really working. My codec choice is Ulaw, so
>>>       
> that
>   
>>> shouldn't be a problem. Any thoughts?
>>> Thanks.
>>>
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>>>
>>>       
>
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