Re: [MMUSIC] Issue in draft-ietf-mmusic-sdp-cs

Andrew Allen <aallen@rim.com> Fri, 13 April 2012 18:17 UTC

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From: Andrew Allen <aallen@rim.com>
To: "Belling, Thomas (NSN - DE/Munich)" <thomas.belling@nsn.com>, "ext Miguel A. Garcia" <Miguel.A.Garcia@ericsson.com>
Thread-Topic: [MMUSIC] Issue in draft-ietf-mmusic-sdp-cs
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Date: Fri, 13 Apr 2012 18:17:40 +0000
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Cc: "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] Issue in draft-ietf-mmusic-sdp-cs
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Thomas

That's certainly one way you can look at it.

However I think the approach the authors have taken is that the address type is the type of the connectionaddress value that follows. Since the connectionaddress has no value ("-") putting the value E164 in the address type is pointless.

Having "PSTN - -" syntax is consistent with the current 3GPP documentation too so I would prefer to keep it that way.

Andrew

> -----Original Message-----
> From: Belling, Thomas (NSN - DE/Munich) [mailto:thomas.belling@nsn.com]
> Sent: Friday, April 13, 2012 10:05 AM
> To: ext Miguel A. Garcia; Andrew Allen
> Cc: mmusic@ietf.org
> Subject: RE: [MMUSIC] Issue in draft-ietf-mmusic-sdp-cs
> 
> Dear Miguel,
> 
> Might be a matter of taste and can certainly be overcome with clear
> descriptive text, but:
> 
> For me a dash instead of E.164 somehow sounds like the host not even
> knowing its addresstype.
> 
> Thomas
> 
> -----Original Message-----
> From: mmusic-bounces@ietf.org [mailto:mmusic-bounces@ietf.org] On Behalf
> Of ext Miguel A. Garcia
> Sent: Wednesday, April 11, 2012 8:21 AM
> To: Andrew Allen
> Cc: mmusic@ietf.org
> Subject: Re: [MMUSIC] Issue in draft-ietf-mmusic-sdp-cs
> 
> As an author,
> 
> I acknowledge that the draft should be clear, and somehow, contradicts
> itself. What the draft tries to say is what Andrew just pointed out: if
> the endpoint is not aware of its E.164 address, but just that there is a
> Circuit-Switched connection, then the c line should be:
> 
>   c=PSTN - -
> 
> /Miguel
> 
> 
> On 10/04/2012 21:15, Andrew Allen wrote:
> >
> > In 5.2.1 of the draft  it shows:
> >
> >                  c= PSTN - -
> >
> > as a valid syntax however in section 5.6.1 it states:
> >
> > The endpoint MUST set the<nettype>  in the "c=" line to "PSTN", and
> the<addrtype>  to "E164".
> >
> > Offline discussions with the authors indicates that they believe this
> > is a bug in 5.6.1, and that the text should say that if the endpoint
> is not aware of its E.164 number, both the<addrtype>
> and<connectionaddress>  should be set to "-".
> >
> > It is proposed that a  change is made to  paragraph in 5.6.1 to
> > clearly separate the cases when the endpoint is aware of its E.164
> number and when it is not.
> >
> > Andrew
> >
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> --
> Miguel A. Garcia
> +34-91-339-3608
> Ericsson Spain
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