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[rtcweb] RTCWEB data channel protocol: Do both endpoints need to send DATA_CHANNEL_OPEN?

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 28 January 2014 08:16 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "rtcweb@ietf.org" <rtcweb@ietf.org>
Thread-Topic: RTCWEB data channel protocol: Do both endpoints need to send DATA_CHANNEL_OPEN?
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Date: Tue, 28 Jan 2014 08:16:22 +0000
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Subject: [rtcweb] RTCWEB data channel protocol: Do both endpoints need to send DATA_CHANNEL_OPEN?
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Hi,

As defined in draft-ietf-rtcweb-data-channel-06, a data channel consists of two unidirectional SCTP streams.

draft-ietf-rtcweb-data-protocol-01 says that, if one endpoint wants to open a data channel, it sends a DATA_CHANNEL_OPEN (using a SCTP stream ID value of its choice). Then, the other endpoints sends DATA_CHANNEL_ACK on the same SCTP stream (eventhough it is a unidirectional stream).

Q1: Assuming that both endpoints want to use the data channel, do both endpoints need to send DATA_CHANNEL_OPEN (on separate SCTP streams)? Or, can one of the endpoints, if it has received DCO, start using the data channel (using a SCTP stream of its choice)?

Regards,

Christer

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