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

Justin Uberti <juberti@google.com> Mon, 03 March 2014 14:13 UTC

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From: Justin Uberti <juberti@google.com>
Date: Mon, 3 Mar 2014 06:12:43 -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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But why is it a problem if other things change (e.g. a=remote-candidates is
set)?


On Mon, Mar 3, 2014 at 5:48 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.
>
> When I call createOffer(), can I be ensure that *only* the port values
> will change?
>
>
>
> No. Why would this be necessary?
>
>
>
> Because the only thing I want to do is to send a new offer, with the same
> port number in each m- line. I don’t want anything else to change.
>
>
>
> Regards,
>
>
>
> Christer
>