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[clue] FW: draft-ejzak-mmusic-data-channel-sdpneg and DCEP

Christer Holmberg <christer.holmberg@ericsson.com> Fri, 21 November 2014 19:20 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "clue@ietf.org" <clue@ietf.org>
Thread-Topic: draft-ejzak-mmusic-data-channel-sdpneg and DCEP
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Date: Fri, 21 Nov 2014 19:20:21 +0000
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Subject: [clue] FW: draft-ejzak-mmusic-data-channel-sdpneg and DCEP
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FYI,

I sent the following to the MMUSIC list.

The CLUE data channel draft currently assumes that DCEP is used to open the CLUE data channel, once it has been negotiated using draft-ejzak.

However, if draft-ejzak forbids usage of DCEP, and/or we don't think it's needed for the CLUE data channel, we can remove it.

In my opinion, the advantage of also using DCEP is that the endpoints can choose when to open the data channel - otherwise it is considered open once the SCTP association has been created.

Regards,

Christer

From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Christer Holmberg
Sent: 21 November 2014 21:17
To: mmusic@ietf.org
Subject: [MMUSIC] draft-ejzak-mmusic-data-channel-sdpneg and DCEP

Hi,

draft-ejzak-mmusic-data-channel-sdpneg currently seems to assume that DCEP will not be used to open data channels - instead data channels will be considered open once the SDP O/A negotiation has finished and the SCTP association used to realize the data channel(s) has been created.

My question is whether the intention is to forbid usage of DCEP together with draft-ejzak-mmusic-data-channel-sdpneg, or whether it should be optional?

If optional, there needs to be a way to indicate that application data shall not be sent until a channel has been opened using DCEP. In addition, it would be useful to be able to indicate which endpoint is responsible for sending the DCEP_CHANNEL_OPEN message.

Regards,

Christer

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