Re: [codec] #5: Mention DTMF in requirements

[Steve Underwood <[e-mail]>]

On 03/29/2010 02:22 AM, Marc Petit-Huguenin wrote:
> On 03/28/2010 11:00 AM, stephen botzko wrote:
>    
>> I would agree with this if I saw reasonable evidence that a
>> preponderance of gateways and sending systems provide the signaling in
>> these RFCs.
>>
>> Since I am not sure that this is the case, I am unconvinced that we can
>> totally remove the requirement.
>>
>> I'd also say that an encoder that detects the DTMF tones and outputs the
>> RFC 4733/34 events would fully meet the requirement.
>>      
> As former CTO of a VoIP provider, I never saw a PSTN provider not supporting at
> least RFC 2833 (even if one of them did not declare it in its SDP)
>
> Perhaps the question can be asked at the next SIPit event.
>    
Its true that RFC2833 is widely deployed. Its even true that many 
systems have updated to RFC4733. Sadly, its also true that there are 
still many quirky implementations widely deployed, and a lot of people 
still need to interwork with audio DTMF.

Steve