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Re: [rtcweb] Does RID require the same ext id for all the m= sections?

Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com> Mon, 11 September 2017 16:04 UTC

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To: Iñaki Baz Castillo <ibc@aliax.net>, "Mo Zanaty (mzanaty)" <mzanaty@cisco.com>
Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
References: <CALiegfnGvkdrhG_hPKGuGuhZCbcL9mUoauheBA3bc15s_G7ihg@mail.gmail.com> <EB2B7F8E-2847-4C8F-8DF4-5BAEE3C1DEE6@cisco.com> <CALiegf=6xRCXAx71XiErwqzwdVBVbFmzhvtaKS77v88Oh569TQ@mail.gmail.com> <881A3BC9-C9ED-4E1E-ACFE-C887333BB672@cisco.com> <CALiegfmerkkf85H_9AOOJq0_Hd=MDj1v_QguucCv6OdXRFqQkw@mail.gmail.com> <D5DC1C96.726D6%mzanaty@cisco.com> <CALiegfkB-DF2njWYzJYg455GddByLK8dQJq21wp+JEWSaJC=sQ@mail.gmail.com>
From: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>
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Date: Mon, 11 Sep 2017 18:04:46 +0200
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Subject: Re: [rtcweb] Does RID require the same ext id for all the m= sections?
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On 11/09/2017 17:52, Iñaki Baz Castillo wrote:
> On Mon, Sep 11, 2017 at 5:02 PM, Mo Zanaty (mzanaty) <mzanaty@cisco.com> wrote:
>> Bundle defines MID, and section 13 restricts all extmap IDs (including MID,
>> RID, etc.) to be consistent across all bundled m= sections, just like PTs. I
>> see no restriction against aliases, nor any reason to impose one.
> The RTP MID extension value is used (should be used when someone
> implements it) to lookup the associated m=section, so the extmap ID
> MUST be unique across all the m=sections in the SDP. Otherwise the
> lookup operation would be impossible.
>
> This has been discussed in this mailing list not so long ago.

Well, while I am against heder extensions aliases, the extension id are 
meant to be unique across all m-sections, so it is possible to get the 
value of the extensions regardless of the m-section to which the RTP 
packet belongs to. It could be possible then to associate the rtp packet 
with the m-section via the MID value, and validate which header 
extensions ids were allowed in it (including the MID one).

IMHO, it would be better to not allow aliases in bundle across m-sections.

Best regards

Sergio

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