Re: [codec] [MMUSIC] SDP Support for Multiple Packetisation Periods

"Miguel A. Garcia" <Miguel.A.Garcia@ericsson.com> Sun, 31 July 2011 08:33 UTC

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Date: Sun, 31 Jul 2011 10:33:32 +0200
From: "Miguel A. Garcia" <Miguel.A.Garcia@ericsson.com>
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To: "Schwarz, Albrecht (Albrecht)" <albrecht.schwarz@alcatel-lucent.com>
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Cc: "codec@ietf.org" <codec@ietf.org>, mmusic <mmusic@ietf.org>
Subject: Re: [codec] [MMUSIC] SDP Support for Multiple Packetisation Periods
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Yeap, I was also going to point to the (already expired) I-D on multiple 
packetization problem draft,

http://tools.ietf.org/id/draft-garcia-mmusic-multiple-ptimes-problem-03.txt

The authors didn't see much interest in solving this problem, so the 
draft was abandoned. If the community realizes that the problem still 
persists, we can easily resurrect it.

/Miguel

On 29/07/2011 11:31, Schwarz, Albrecht (Albrecht) wrote:
> Paul,
>
> 1) SDP =>  IETF MMUSIC
>
> 2) ptime problem statement ("well known"), see
>
> Multiple Packetization Times in the Session Description Protocol (SDP):
> Problem Statement, Requirements&  Solution
> draft-garcia-mmusic-multiple-ptimes-problem-03.txt
> http://tools.ietf.org/html/draft-garcia-mmusic-multiple-ptimes-problem-03
>
> 3) Solution:
> = revised SDP Offer/Answer
> see
> a) SDP) Capability Negotiation RFC 5939
>     http://tools.ietf.org/html/rfc5939
> b) SDP Media Mapabilities Negotiation
>     http://tools.ietf.org/wg/mmusic/draft-ietf-mmusic-sdp-media-capabilities/
>
> Thus, revised SDP Offer/Answer must be used (instead of legacy SDP Offer/Answer RFC 3264).
>
> -Albrecht
>
>
>
>> -----Original Message-----
>> From: codec-bounces@ietf.org [mailto:codec-bounces@ietf.org]
>> On Behalf Of Paul Beaumont
>> Sent: Donnerstag, 28. Juli 2011 19:31
>> To: codec@ietf.org
>> Subject: [codec] SDP Support for Multiple Packetisation Periods
>>
>> All
>>
>> Apologies, being first time to IETF and its mailing lists, if
>> this is not the right mailing list to post this request to.
>>
>> On initial inspection it looks like it is not possible to
>> specify in SDP the specific packetisation period associated
>> with a codec that is available through negotiation. Specific
>> case I am concerned with is to support (1) G.711 @ PP=10ms
>> and (2) G.711 @ PP=20ms; prioritised in that order. The ptime
>> parameter would appear to apply to both.
>>
>> Please can you advise where I should submit this question or
>> if this is the right frum then whether the above observation
>> is correct and any supplemental information/comments you may have?
>>
>> Thanks
>> Paul Beaumont
>>
>>
>>
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>

-- 
Miguel A. Garcia
+34-91-339-3608
Ericsson Spain