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Re: [MMUSIC] BUNDLE DISCUSION Q6: Do we always mandate 2 Offer/Answers during session establishment?

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 09 September 2013 18:28 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Martin Thomson <martin.thomson@gmail.com>
Thread-Topic: [MMUSIC] BUNDLE DISCUSION Q6: Do we always mandate 2 Offer/Answers during session establishment?
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Date: Mon, 09 Sep 2013 18:28:28 +0000
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References: <7594FB04B1934943A5C02806D1A2204B1C483C45@ESESSMB209.ericsson.se> <5224F4BB.8000904@alum.mit.edu> <CAOJ7v-20smCmAYG_be_4g2PwDigXKJu+x6yRkAzPXJ_YHWse-Q@mail.gmail.com> <522A27AB.1020102@alum.mit.edu> <CABkgnnWA7n7jy9T7cROTZSKrKAc9jCwb=68Whqt7qvVMgCQ8yA@mail.gmail.com> <7594FB04B1934943A5C02806D1A2204B1C499BB7@ESESSMB209.ericsson.se> <CABkgnnXBQobdfqVzrr=Mq9P9iDcZN=5TJze+Ld=HpN=iuhp6gQ@mail.gmail.com> <CAOJ7v-1gjeD0gfbCOfubbEZo80ZH+p8d5gKO==UdyQx_jjY5bw@mail.gmail.com> <522D8D1E.9080407@alvestrand.no> <7594FB04B1934943A5C02806D1A2204B1C49B1A3@ESESSMB209.ericsson.se> <CABkgnnUcfEQy7C3BSyA_-r5g9x=9HbU6p31i7qGfGVEMcesn3Q@mail.gmail.com> <7594FB04B1934943A5C02806D1A2204B1C49B7D4@ESESSMB209.ericsson.se>, <CABkgnnUKkJhyFwVqAJrz_xJiM0To2hXyAadBENQkazVQwKOi6Q@mail.gmail.com>
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Subject: Re: [MMUSIC] BUNDLE DISCUSION Q6: Do we always mandate 2 Offer/Answers during session establishment?
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Hi,

>> Sure. If the Offerer assigns a previously negotiated BUNDLE address (or, an address that will become the new BUNDLE address) to those m- lines, there is no need for a second o/a exchange.
>
> Perhaps the single m-line offer/answer performed to establish the data
> channel will include BUNDLE, but it would be a little redundant. 

Correct.

The only advantage of putting a single m- line into a BUNDLE group is that you will, in the Answer, find out whether the Answerer supports BUNDLE.

But, for that we could also define e.g. a feature/option-tag, so that one doesn't have to use BUNDLE just to figure out whether the other end supports it or not...

>When you talk about initial offer, you should really be talking about the first offer that contains BUNDLE.

Or, the offer when the offerer still doesn't know whether the answerer supports BUNDLE - IF there is a way for endpoints to exchange that data without actually using BUNDLE.

Regards,

Christer

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