Re: [codec] #5: Mention DTMF in requirements
"codec issue tracker" <trac@tools.ietf.org> Fri, 26 March 2010 21:39 UTC
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Subject: Re: [codec] #5: Mention DTMF in requirements
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#5: Mention DTMF in requirements ------------------------------------+--------------------------------------- Reporter: hoene@… | Owner: Type: defect | Status: new Priority: major | Milestone: Component: requirements | Version: Severity: Active WG Document | Keywords: ------------------------------------+--------------------------------------- Comment(by kpfleming@…): RFC 2833 has been superseded by RFC 4733, but in any case, I think it's preferable in nearly all instances to have the tone detection be done at the conversion point into the proposed codec, not after. There are many other tones besides DTMF that can be carried via these out-of-band payload types, and we'd have to identify which ones should survive. For example, for Super G3 FAX machines, the answering endpoint will generate an ANSam signal, which is both amplitude modulated and has periodic phase reversals. This signal must be transported to the calling endpoint to begin the V.8 negotiation process.. which is fairly easy to do if the IP/TDM gateway at the answering endpoint's end does the detection and transmission using RFC 4733... but could be much harder (and maybe not possible) at the calling gateway's end. In addition, there are 'pure IP' endpoints that would prefer not to have to have DSP-type tone detectors running on the incoming audio stream at all. If the point of this issue to allow this codec to be used to successfully transit an IP network between two TDM networks, I'd suggest that out-of- band tone transport is far preferable to trying to ensure that the codec will carry the tones adequately to allow them to be detected after regeneration. -- Ticket URL: <http://trac.tools.ietf.org/wg/codec/trac/ticket/5#comment:1> codec <http://tools.ietf.org/codec/>
- [codec] #5: Mention DTMF in requirements codec issue tracker
- Re: [codec] #5: Mention DTMF in requirements codec issue tracker
- Re: [codec] #5: Mention DTMF in requirements Christian Hoene
- Re: [codec] #5: Mention DTMF in requirements stephen botzko
- Re: [codec] #5: Mention DTMF in requirements Michael Knappe
- Re: [codec] #5: Mention DTMF in requirements, Tes… Christian Hoene
- Re: [codec] #5: Mention DTMF in requirements Marc Petit-Huguenin
- Re: [codec] #5: Mention DTMF in requirements stephen botzko
- Re: [codec] #5: Mention DTMF in requirements Marc Petit-Huguenin
- Re: [codec] #5: Mention DTMF in requirements, Tes… Wyss, Felix
- Re: [codec] #5: Mention DTMF in requirements, Tes… Steve Underwood
- Re: [codec] #5: Mention DTMF in requirements Steve Underwood
- Re: [codec] #5: Mention DTMF in requirements James Rafferty
- Re: [codec] #5: Mention DTMF in requirements stephen botzko
- Re: [codec] #5: Mention DTMF in requirements Peter Saint-Andre
- Re: [codec] #5: Mention DTMF in requirements James Rafferty
- Re: [codec] #5: Mention DTMF in requirements stephen botzko
- Re: [codec] #5: Mention DTMF in requirements Brian West
- Re: [codec] #5: Mention DTMF in requirements Brian West
- Re: [codec] #5: Mention DTMF in requirements Brian West
- Re: [codec] #5: Mention DTMF in requirements Brian West
- Re: [codec] #5: Mention DTMF in requirements Michael Knappe
- Re: [codec] #5: Mention in requirements, FAX? Christian Hoene
- Re: [codec] #5: Mention in requirements, FAX? James Rafferty
- Re: [codec] #5: Mention DTMF in requirements Christian Hoene
- Re: [codec] #5: Mention in requirements, FAX? Marc Petit-Huguenin
- Re: [codec] #5: Mention in requirements, FAX? Michael Knappe
- Re: [codec] #5: Mention DTMF in requirements stephen botzko
- Re: [codec] #5: Mention in requirements, FAX? stephen botzko
- Re: [codec] #5: Mention in requirements, FAX? Michael Knappe
- Re: [codec] #5: Mention DTMF in requirements Christian Hoene
- Re: [codec] #5: Mention DTMF in requirements stephen botzko
- Re: [codec] #5: Mention DTMF in requirements James Rafferty
- Re: [codec] #5: Mention DTMF in requirements Raymond (Juin-Hwey) Chen
- Re: [codec] #5: Mention DTMF in requirements Roman Shpount
- Re: [codec] #5: Mention DTMF in requirements Marc Petit-Huguenin
- Re: [codec] #5: Mention DTMF in requirements Wyss, Felix
- Re: [codec] #5: Mention DTMF in requirements stephen botzko
- Re: [codec] #5: Mention DTMF in requirements Roman Shpount
- Re: [codec] #5: Mention DTMF in requirements Roman Shpount
- Re: [codec] #5: Mention DTMF in requirements stephen botzko
- Re: [codec] #5: Mention DTMF in requirements Marc Petit-Huguenin
- Re: [codec] #5: Mention DTMF in requirements Raymond (Juin-Hwey) Chen
- Re: [codec] #5: Mention DTMF in requirements Brian West
- Re: [codec] #5: Mention DTMF in requirements Raymond (Juin-Hwey) Chen
- Re: [codec] #5: Mention DTMF in requirements Raymond (Juin-Hwey) Chen
- Re: [codec] #5: Mention DTMF in requirements Raymond (Juin-Hwey) Chen
- Re: [codec] #5: Mention DTMF in requirements Raymond (Juin-Hwey) Chen
- Re: [codec] #5: Mention DTMF in requirements Roman Shpount
- Re: [codec] #5: Mention DTMF in requirements Benjamin M. Schwartz
- Re: [codec] #5: Mention DTMF in requirements Roman Shpount
- Re: [codec] #5: Mention DTMF in requirements Peter Saint-Andre
- Re: [codec] #5: Mention DTMF in requirements codec issue tracker
- Re: [codec] #5: Mention DTMF in requirements stephen botzko
- Re: [codec] #5: Mention DTMF in requirements Raymond (Juin-Hwey) Chen
- Re: [codec] #5: Mention DTMF in requirements Kevin P. Fleming
- Re: [codec] #5: Mention DTMF in requirements stephen botzko
- Re: [codec] #5: Mention DTMF in requirements Koen Vos
- Re: [codec] #5: Mention DTMF in requirements stephen botzko
- Re: [codec] #5: Mention DTMF in requirements Wyss, Felix
- Re: [codec] #5: Mention DTMF in requirements stephen botzko
- Re: [codec] #5: Mention DTMF in requirements Michael Knappe
- Re: [codec] #5: Mention DTMF in requirements codec issue tracker