Re: [rtcweb] JSEP-06: How to create the second offer where only the port numbers are changed?

Justin Uberti <juberti@google.com> Sun, 02 March 2014 21:49 UTC

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From: Justin Uberti <juberti@google.com>
Date: Sun, 2 Mar 2014 13:49:00 -0800
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To: Christer Holmberg <christer.holmberg@ericsson.com>
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Subject: Re: [rtcweb] JSEP-06: How to create the second offer where only the port numbers are changed?
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On Mon, Feb 24, 2014 at 9:07 AM, Christer Holmberg <
christer.holmberg@ericsson.com> wrote:

>  Hi,
>
>
>
> As specified in BUNDLE, before the remote peer has indicated support of
> BUNDLE, all m- lines (including those within to a bundle group) must have
> unique port numbers.
>
>
>
> Then, when the remote peer has indicated support of BUNDLE, a second offer
> (called the BAS offer) needs to be sent, in which the same port number is
> assigned to all m- lines within a bundle group.
>
>
>
> My question is: how do I create the BAS offer? I don’t want to change
> anything – I just want to get an SDP with the BUNDLE port assigned to all
> m- lines. Is there a flag in createOffer() for that?
>
>
>
The implementation knows that any offers that are created after the BUNDLE
answer should have the same port numbers. So, the app could push the
createOffer button once it receives the answer if it wanted to ensure this
happened immediately. Otherwise, there will be an onnegotiationneeded event
once ICE completes, and the offer sent at that time will have the updated
ports.