Subject: Re: [MMUSIC] BUNDLE goes UP: Do we need port zero for bundle-only m- lines?

From: Christer Holmberg <[email-masked]>
Date: Mon, 23 Sep 2013 10:47:10 +0000

Hi,

There has been no conclusion in the discussion regarding the usage of port zero in 'bundle-only' m- lines, so I'll try to bring it up to surface again. As the SDP 'bundle-only' attribute is currently suggested to be defined in BUNDLE, I'd like to solve the issue.

The proposal by Adam in Berlin was that, for 'bundle-only' m- lines, in an Offer, the Offerer would assign a zero port value to the m- lines. If the Answerer supports BUNDLE, it will assign the shared (non-zero) BUNDLE address to the m- lines. If the Answerer does NOT support BUNDLE, it is expected to reject the m- lines by assigning a port zero value also in the Answer (according the RFC 3264 procedures).

- Some raised comments that RFC 3264 mandates an offered port zero m- line to be answered with a port zero m- line, and that support of BUNDLE doesn't change that.

- Some suggested that the 'bundle-only' m- lines aren't added until the "clean-up" Offer is sent, when all bundled m- lines (including the 'bundle-only' ones) are assigned the shared BUNDLE address.

- And, of course we have the general suggestion that one should be able to assign a shared address to bundled m- lines from start, in which case there is no need for port zero.

Regards,

Christer