Re: [AVTCORE] [Technical Errata Reported] RFC4733 (3451)

Magnus Westerlund <magnus.westerlund@ericsson.com> Wed, 16 January 2013 16:54 UTC

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Date: Wed, 16 Jan 2013 17:54:39 +0100
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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To: Marc Petit-Huguenin <petithug@acm.org>
References: <20130111132451.A8C86B1E002@rfc-editor.org> <50F589BB.5010709@ericsson.com> <50F6D929.2090406@acm.org>
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Subject: Re: [AVTCORE] [Technical Errata Reported] RFC4733 (3451)
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On 2013-01-16 17:45, Marc Petit-Huguenin wrote:
> On 01/15/2013 08:54 AM, Magnus Westerlund wrote:
>> Hi,
> 
>> (As Individual)
> 
>> Are we certain that the RTP payload format will never be sent
>> over two different but linked SSRCs to the original audio. There
>> is such a use case (See RFC 3388) where DTMF and original audio
>> are sent in two different RTP sessions and thus with different
>> SSRCs (although, they could have the same number for binding
>> reasons). I fear the proposed corrected text is to restrictive.
> 
> Right.  I propose this:
> 
> Named telephone events are carried as part of the audio stream and
> if they use the same SSRC (therefore the same timing and sequence
> number space), they MUST use the same timestamp clock rate as the
> regular audio channel to simplify the generation of audio waveforms
> at a gateway.
> 

I think this is much better.

Cheers

Magnus Westerlund

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