Re: [AVTCORE] WG last call on draft-ietf-avtcore-avp-codecs-01
"DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com> Tue, 19 March 2013 17:15 UTC
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From: "DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com>
To: Colin Perkins <csp@csperkins.org>
Thread-Topic: [AVTCORE] WG last call on draft-ietf-avtcore-avp-codecs-01
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Date: Tue, 19 Mar 2013 17:15:22 +0000
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Cc: Magnus Westerlund <magnus.westerlund@ericsson.com>, IETF AVTCore WG <avt@ietf.org>
Subject: Re: [AVTCORE] WG last call on draft-ietf-avtcore-avp-codecs-01
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I'm still confused. Surely PCMU0 was recommended before this update and is recommended now. DVI4 was recommended before this update and is now optional. I guess the result of that is that I can be conformant but implement neither, although it will not be a terribly useful implementation. Regards Keith > -----Original Message----- > From: Colin Perkins [mailto:csp@csperkins.org] > Sent: 15 March 2013 18:00 > To: DRAGE, Keith (Keith) > Cc: Magnus Westerlund; IETF AVTCore WG > Subject: Re: [AVTCORE] WG last call on draft-ietf-avtcore-avp-codecs-01 > > On 12 Mar 2013, at 16:40, DRAGE, Keith (Keith) wrote: > > I'm trying to parse the final sentence of the change made to RFC 3551. > > > > Essentially this i-d modifies: > > > > " Audio applications operating under this profile SHOULD, at a minimum, > > be able to send and/or receive payload types 0 (PCMU) and 5 (DVI4). > > This allows interoperability without format negotiation and ensures > > successful negotiation with a conference control protocol." > > > > To become: > > > > " Audio applications operating under this profile SHOULD, at a minimum, > > be able to send and/or receive payload type 0 (PCMU). > > This allows interoperability without format negotiation and ensures > > successful negotiation with a conference control protocol. Some > > environments MAY make support for PCMU mandatory." > > > > What the final sentence currently says is that some environments provide > an option to make support for PCMU mandatory, which implies that other > environments do not provide such an option. Neither of those make sense to > me and there I believe that cannot be the meaning. > > > > I suspect we are looking for sentence that looks more like "Some > environments REQUIRE support for PCMU", but I am not sure if there is an > "only" floating around in there somewhere. > > > I don't think the draft ought to say "only". This sentence looks to be > addressing the RTCWeb use case, which makes PCMU mandatory to implement > but also allows other codecs. > > To my reading, "Some environments MAY make support for PCMU mandatory" and > "Some environments REQUIRE support for PCMU" are equivalent, but I have no > objection to the change if you think it clearer. > > -- > Colin Perkins > http://csperkins.org/ > >
- [AVTCORE] WG last call on draft-ietf-avtcore-avp-… Magnus Westerlund
- Re: [AVTCORE] WG last call on draft-ietf-avtcore-… DRAGE, Keith (Keith)
- Re: [AVTCORE] WG last call on draft-ietf-avtcore-… Colin Perkins
- Re: [AVTCORE] WG last call on draft-ietf-avtcore-… Colin Perkins
- Re: [AVTCORE] WG last call on draft-ietf-avtcore-… DRAGE, Keith (Keith)
- Re: [AVTCORE] WG last call on draft-ietf-avtcore-… Somogyi, Gabor (NSN - HU/Budapest)
- Re: [AVTCORE] WG last call on draft-ietf-avtcore-… Ali C. Begen (abegen)
- Re: [AVTCORE] WG last call on draft-ietf-avtcore-… Somogyi, Gabor (NSN - HU/Budapest)
- Re: [AVTCORE] WG last call on draft-ietf-avtcore-… Magnus Westerlund
- Re: [AVTCORE] WG last call on draft-ietf-avtcore-… Magnus Westerlund
- Re: [AVTCORE] WG last call on draft-ietf-avtcore-… Timothy B. Terriberry