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Re: [MMUSIC] ICE options: need new optional and/or required attributes?

Ari Keränen <ari.keranen@ericsson.com> Sun, 02 March 2014 00:55 UTC

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Date: Sun, 02 Mar 2014 00:55:38 +0000
From: Ari Keränen <ari.keranen@ericsson.com>
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To: Emil Ivov <emcho@jitsi.org>
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Subject: Re: [MMUSIC] ICE options: need new optional and/or required attributes?
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On 3/1/14 10:08 AM, Emil Ivov wrote:
>
> On 28.02.2014, at 17:58, Ari Keränen <ari.keranen@ericsson.com> wrote:
>
>> Hi all,
>>
>> One open issue regarding ICE-bis has been the semantics of the ice-options attribute. Currently there is no way of saying "do aggressive ICE even if you don't understand this option" or "reject my offer if you don't understand this option".
>>
>> One way of solving this would be to introduce a new attribute like:
>>
>> a=ice-options-required:foo
>>
>> That is, if "foo" is unknown option to the answerer, the offer is rejected. In addition to solving the second case, it could also be used to test for the first and if option was not understood, simply leave it out of the new offer. Of course this would result in one signaling exchange of delay, and hence for the first case (do still aggressive) we could also introduce yet another option:
>>
>> a=ice-options-optional:bar
>
> I don't have a strong opinion on this but the latter seems to be the only one offering consistency with existing implementations.

Do you mean that existing implementations ignore unknown options and 
still do aggressive ICE?

The first one, understand or fail, is what Martin Thomson requested at 
the previous meeting. With that you can actually accomplish both, but 
with some penalty.


Cheers,
Ari

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