Re: [MMUSIC] BUNDLE: SDP Offer Types

Christer Holmberg <christer.holmberg@ericsson.com> Sun, 02 June 2013 18:42 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] BUNDLE: SDP Offer Types
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Date: Sun, 2 Jun 2013 18:42:00 +0000
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Subject: Re: [MMUSIC] BUNDLE: SDP Offer Types
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Hi,

>> I'll throw the ball out with suggesting the following ones:
>>
>> -*Bundle restart offer* (different port value, currently referred to as
>> "first offer")
>>
>> The reason I use "restart" wording is because this is used, no matter
>> whether in the beginning of the session or mid-session, to
>> (re-)negotiate the usage of BUNDLE, and the bundle address information
>> selection.
>>
>> -*Bundle sync offer* (identical port value, currently referred to as
>> "second offer")
>>
>> The reason I used "sync" wording is because this is used to ensure that
>> intermediaries have correct address information for each m- line.
>>
>> Keep in mind that we may even need to split the sync offer into more sub
>> types, when we get into the details of adding new m- lines etc, but I'd
>> like to agree a base to start from :)
>
> Above seems like a good start, but I'm still grappling with some things
> and don't know how to talk about concisely:
>
> I understand that the next offer after a Bundle Restart Offer will
> typically be a Bundle Sync Offer. But if there is another offer after a
> Bundle Sync Offer, and it doesn't change anything about the bundle, then
> is it still a Bundle Sync Offer?

Currently, yes. 

> Also, I don't believe the above are mutually exclusive. If I send an
> offer to add a new m-line to a bundle, and I give it distinct address
> info so that the answerer may take it out of the bundle if needed, then
> is that a Bundle Restart Offer or a Bundle Sync Offer? It seems to be a
> bit of each. And of course there may be multiple bundles described by
> the SDP, and these terms apply independently to each.
>
> Maybe we need a couple more terms for:
>
> - offer that adds a new m-line to bundle using the existing bundle
>   address info.

Technically that is a Bundle Sync Offer, but I DO agree that the wording is not good in this case - as it's not only about synchronization.

> - offer that adds a new m-line to an existing bundle using unique
>   address info.

I agree that doesn't fit the current definitions.

However, we will have to agree on whether we allow that in the first place, or whether the offerer will have to use 1) same address information or 2) different address information for ALL m- lines (Bundle Restart Offer).

Regards,

Christer