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Re: [MMUSIC] [Ice] SDP rtcp attribute with trickle ICE

Peter Saint-Andre <stpeter@stpeter.im> Tue, 23 February 2016 04:13 UTC

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To: Christer Holmberg <christer.holmberg@ericsson.com>, Roman Shpount <roman@telurix.com>
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From: Peter Saint-Andre <stpeter@stpeter.im>
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Date: Mon, 22 Feb 2016 21:13:06 -0700
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Cc: Ari Keränen <ari.keranen@ericsson.com>, "mmusic@ietf.org" <mmusic@ietf.org>, Marc Petit-Huguenin <marc@petit-huguenin.org>, "ice@ietf.org" <ice@ietf.org>, 🔓Dan Wing <dwing@cisco.com>, "snandaku@cisco.com" <snandaku@cisco.com>
Subject: Re: [MMUSIC] [Ice] SDP rtcp attribute with trickle ICE
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On 1/20/16 1:12 PM, Christer Holmberg wrote:
> Another, more administrative issue, is that we also would need to get this change into JSEP and trickle ICE. Unless I remember wrong, both of those specs currently references RFC 5245.

draft-ietf-ice-trickle references icebis.

> -----Original Message-----
> From: Ice [mailto:ice-bounces@ietf.org] On Behalf Of Christer Holmberg
> Sent: 20 January 2016 22:10
> To: Roman Shpount <roman@telurix.com>
> Cc: Ari Keränen <ari.keranen@ericsson.com>; mmusic@ietf.org; Marc Petit-Huguenin <marc@petit-huguenin.org>; ice@ietf.org; 🔓Dan Wing <dwing@cisco.com>; snandaku@cisco.com
> Subject: Re: [Ice] [MMUSIC] SDP rtcp attribute with trickle ICE
>
> Hi Roman,
>
>>> Your suggested text looks ok, but it does not solve my issue :) I
>>> think it should be clear that, if there is no RTCP candidate, the spec does not define usage of the SDP rtcp attribute.
>>
>> Well, in my proposed text "if RTCP candidate is present and not equal
>> to the same address and the next higher port number of the RTP candidate, the agent MUST encode the RTCP candidate using the a=rtcp attribute".
>> Do you also want text saying that a=rtcp attribute MUST not be present of no RTCP candidates are present and rtcp-mux is not used?
>
> I am not sure we need to say anything about mux.
>
> When reading your text again, I now agree that it covers my case. I just hope it is clear enough :)
>
> Perhaps, in the trickle ICE document, we could have a note somewhere clarifying that the RTCP candidate is not used when the RTP port is 9.

We removed all of the SDP-related text from draft-ietf-ice-trickle 
because we were supposed to write a trickle-sdp or trickle-sip 
specification. Right now we don't have that text about the RTP port in 
draft-ietf-ice-trickle...

Peter

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