From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Bernard Aboba <bernard_aboba@hotmail.com>,
 "rtcweb@ietf.org" <rtcweb@ietf.org>
Thread-Topic: JSEP and draft-ietf-mmusic-sdp-bundle-negotiation-03
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Date: Wed, 20 Feb 2013 11:48:42 +0000
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Subject: Re: [rtcweb] JSEP and draft-ietf-mmusic-sdp-bundle-negotiation-03
Precedence: list

Hi,

>> Good questions, for which I don't have any answers at this point :)
>>=20
>> But, IF we can agree on this as a way forward, one of the next steps is =
to look at the JSEP impacts.
>
> [BA] The problem is that my opinion will differ depending on whether the =
SDP in question is to be used in the API or over the wire.=20

True. But, if SDP is NOT used on the wire, the BUNDLE document does not put=
 any requirements on whatever other signaling protocol you may be using. Yo=
u can use a protocol that ONLY signals different port numbers, or one that =
ONLE signals identical port numbers, or one that ONLY signals a single port=
 number, on the wire, and there is nothing BUNDLE can do about it :)=20

BUNDLE is only about users of SDP Offer/Answer - no matter whether it's an =
API or a wire protocol.

>The "different port" formulation makes good sense to me if you are looking=
 for backward compatibility with existing SIP/SDP implementations which are=
 likely to send an error=20
>in response to a "same port" formulation.=A0=A0 So if this is an "on the w=
ire" question I give it a thumbs up.=20
>
>However, if you are asking me whether it makes sense for createOffer() to =
output SDP with different ports by default, when 99 percent of applications=
 are=20
>likely to not be doing SIP interop, I would say "no".=A0=A0Then the next q=
uestion is whether there needs to be a mechanism in the API for indicating =
a preference for different ports,=20
>when this is desired.=20

That's a good discussion topic for JSEP :)

Regards,

Christer