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

Stephen,

I'd suggest SHOULD.  Using RFC 2833 / RFC 4733 is preferred to ensure passage, but if the DTMF can be passed in native form and still be detectable, that would be a big plus.

James
From: stephen botzko [mailto:stephen.botzko@gmail.com]
Sent: Friday, April 02, 2010 9:54 AM
To: James Rafferty
Cc: Steve Underwood; codec@ietf.org
Subject: Re: [codec] #5: Mention DTMF in requirements

Are you two suggesting that in-band DTMF is a MUST?  Or alternatively a SHOULD?

Stephen Botzko
On Fri, Apr 2, 2010 at 9:48 AM, James Rafferty <James.Rafferty@dialogic.com<mailto:James.Rafferty@dialogic.com>> wrote:
I'd agree with Steve that are still many deployments which do not use RFC 2833 or RFC 4733. In our gateways, we've had to support interworking variations of tone support such as INFO and in-band, in addition to the RFC 2833 / RFC 4733.

James
-----Original Message-----
From: codec-bounces@ietf.org<mailto:codec-bounces@ietf.org> [mailto:codec-bounces@ietf.org<mailto:codec-bounces@ietf.org>] On Behalf Of Steve Underwood
Sent: Friday, April 02, 2010 2:27 AM
To: codec@ietf.org<mailto:codec@ietf.org>
Subject: Re: [codec] #5: Mention DTMF in requirements
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

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