Re: [MMUSIC] AD review: draft-ietf-mmusic-sdp-cs-16
"Miguel A. Garcia" <Miguel.A.Garcia@ericsson.com> Mon, 14 January 2013 09:20 UTC
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Date: Mon, 14 Jan 2013 10:20:31 +0100
From: "Miguel A. Garcia" <Miguel.A.Garcia@ericsson.com>
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To: Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>
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Cc: mmusic <mmusic@ietf.org>
Subject: Re: [MMUSIC] AD review: draft-ietf-mmusic-sdp-cs-16
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I have just submitted version -17. /Miguel On 14/01/2013 10:19, Gonzalo Camarillo wrote: > Hi Miguel Angel, > > thanks for your quick response. I am OK with all your proposals below. > When you implement the changes, please post a new revision of the draft. > > Thanks, > > Gonzalo > > On 14/01/2013 11:11 AM, Miguel A. Garcia wrote: >> Hi Gonzalo: >> >> Here are some inline comments. I am about to post version -17 addressing >> your comments: >> >> >> On 11/01/2013 12:50, Gonzalo Camarillo wrote: >>> Hi, >>> >>> I just got a publication request for the following draft: >>> >>> http://tools.ietf.org/html/draft-ietf-mmusic-sdp-cs-16 >>> >>> Please, find below my AD review. >>> >>> Cheers, >>> >>> Gonzalo >>> >>> >>> draft-ietf-mmusic-sdp-cs-16: >>> >>> Page 10: remove the indentation of the following paragraph. Indented >>> paragraphs are typically used to provide clarifications while this one >>> contains normative language: >>> >>> Note that <addrtype> and/or <connection-address> MUST NOT be >>> omitted when unknown since this would violate basic syntax of SDP >>> [RFC4566]. In such cases, they MUST be set to a "-". >> >> Ok. >> >>> >>> Section 5.2.3.1 provides a "format" for the cs-correlation attribute. >>> However, its ABNF formal syntax is in Section 5.7. So, why does Section >>> 5.2.3.1 also contain a syntax for the attribute... and what type of >>> syntax is that? >> >> The sort-of-syntax in Section 5.2.3.1 is simply an introduction to the >> three types of correlation mechanisms that can be used. So, the syntax >> is the way to introduce to Sections 5.2.3.2, 5.2.3.3, and 5.2.3.4. >> >> But I understand your point. I suggest removing the syntax from there >> and including a pointer to Section 5.7, where the formal syntax is >> described. >> >>> >>> Page 14: the text says: >>> >>> To mitigate this problem implementations >>> should consider only some of the rightmost digits from the E.164 >>> >>> Can we provide a more concrete advice (or at least some discussion) on >>> the number of digits to consider? >> >> This is a hard problem even to provide guidance, because the PSTN E.164 >> numbers have a variable length. So, if you want to do it right, you >> should become aware of the number plan in the network you are camping. >> But this is outside the scope of the specification. >> >> We can add a note to refer to ITU-T E.164 specification in order for >> implementations to consider what the right number of digits is. >> >>> >>> Page 15: we define how to encode a binary value in hexadecimal format >>> and represent it as a two-digit ASCII value. Can we point to an existing >>> specification that defines how to do that instead of specifying it >>> inline? >>> >> >> Yeap, and I found that there is an RFC specifying it (there is always an >> RFC specifying what you want :-). It is RFC 4648 and we are referring to >> the base16 (or "hex") encoding. We will change the text accordingly. >> >> >>> Page 17: the text says: >>> >>> Implementations are advised to select a number of DTMF digits that >>> provide enough assurance that the call is related, but on the >>> other hand do not prolong the bearer setup time unnecessarily. >>> >>> Can we provide a more concrete recommendation? >> >> Ok, I guess we are talking of 5 to 10 digits. >> >>> >>> Page 17: Section 5.2.3.4 specifies what to do when the correlation >>> fails. However, that is described in general in Section 5.3.3. Why don't >>> we move all the statements about how to decide whether the sessions are >>> correlated to Section 5.3.3? Now, the following statement contradicts >>> what Section 5.3.3 says, for example: >>> >>> the passive side >>> SHOULD treat the circuit-switched bearer as not correlated to the >>> ongoing session. >> >> ok. >> >>> >>> The indented text right after the statement above talks about >>> suppressing alerting. Such a supression is applicable to any session, >>> not only those that are correlated using DTMF tones. So, we could also >>> move that discussion to Section 5.3.3. >> >> ok too. >> >>> >>> Section 5.5: rephrase the following sentence (possibly splitting it into >>> more than one sentence) so that it is clearer: >>> >>> Note that this may result in the recipient of the initial Offer in >>> rejecting the Offer if the recipient of the Offer is not aware of >>> its own E.164 number, and thus concluding that it will not be >>> possible to establish a circuit-switched bearer since neither >>> party is aware of their E.164 number. >> >> Done >> >> >> >> Thanks, >> >> >>> >>> >>> >>> >>> _______________________________________________ >>> mmusic mailing list >>> mmusic@ietf.org >>> https://www.ietf.org/mailman/listinfo/mmusic >>> >> > -- Miguel A. Garcia +34-91-339-3608 Ericsson Spain
- [MMUSIC] AD review: draft-ietf-mmusic-sdp-cs-16 Gonzalo Camarillo
- [MMUSIC] AD review: draft-ietf-mmusic-sdp-cs-16 Gonzalo Camarillo
- Re: [MMUSIC] AD review: draft-ietf-mmusic-sdp-cs-… Gonzalo Camarillo
- Re: [MMUSIC] AD review: draft-ietf-mmusic-sdp-cs-… Miguel A. Garcia
- Re: [MMUSIC] AD review: draft-ietf-mmusic-sdp-cs-… Gonzalo Camarillo
- Re: [MMUSIC] AD review: draft-ietf-mmusic-sdp-cs-… Miguel A. Garcia