Re: [rtcweb] SDP Offer/Answer draft-jennings-rtcweb-signaling - Scope

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 18 October 2011 10:18 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: =?iso-8859-1?Q?I=F1aki_Baz_Castillo?= <ibc@aliax.net>, Ravindran Parthasarathi <pravindran@sonusnet.com>
Date: Tue, 18 Oct 2011 12:18:13 +0200
Thread-Topic: [rtcweb] SDP Offer/Answer draft-jennings-rtcweb-signaling - Scope
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Cc: Jonathan Rosenberg <jonathan.rosenberg@skype.net>, "rtcweb@ietf.org" <rtcweb@ietf.org>, "public-webrtc@w3.org" <public-webrtc@w3.org>
Subject: Re: [rtcweb] SDP Offer/Answer draft-jennings-rtcweb-signaling - Scope
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Hi, 

>No, this is not a draft about a "default signaling protocol" 
>for RTCweb. Wrong. This is just a protocol for communication 
>between the JavaScript code and the RTCweb stack in the 
>browser. It does NOT mandate how the signaling messages are 
>sent on-the-wire.

Eventhough the draft does not suggest a default signaling protocol, I don't think that is completely true that it is only between the JS app and broswer. At least it's not very clear.

- Section 5.1 says: "ROAP messages are typically carried over a **reliable transport** (likely HTTP via XMLHttpRequest or WebSockets),..."

- Section 5.3.3 defines an "OK" message, which is used to cease **re-transmissions** of the ANSWER.

- In addition, there is text talking about **ROAP signaling messages** (and gateways translating between those and SIP messages).

So, while I support and offer/answer based approach, I think we need to get a clearer understanding of the scope.

Regards,

Christer