Re: [rtcweb] draft-ibc-rtcweb-sip-websocket -- WebSocket Transport for Session Initiation Protocol (SIP)

Hi Inaki

I have few initial comments on your draft

1) in Section 3, its mentioned that there is no real benefit of using SIP over Websockets. If this is the case, why are you proposing integrating SIP with Websockets?
2) Also just integrating SIP for signaling case is really no use, as there are several other ways of achieving signaling in web - E.g. using libjingle of WebRTC, etc
3) In Section 4, you mentioned that since Websocket is a reliable transport protocol, the websocket sub-protocol defined for SIP also becomes reliable. I don't agree with this - The websocket connection is actually initiated by the web browser client towards the web server and this connection needs to be kept alive through some keep alive mechanism. Otherwise the connection may close. I am not sure of reliability.
4) In Section 4.1,I am not clear of the Via transport parameter having the value of "WS". Why do you need this when the whole SIP message is going as part of WebSocket payload [Using websocket API]?

Thans

Regards
Ranjit

-----Original Message-----
From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of Iñaki Baz Castillo
Sent: Tuesday, September 13, 2011 10:43 PM
To: rtcweb@ietf.org
Subject: [rtcweb] draft-ibc-rtcweb-sip-websocket -- WebSocket Transport for Session Initiation Protocol (SIP)

Hi all,

A draft describing a mechanism for usage of WebSocket protocol as the
transport between SIP entities has been submitted and can be found at:

  HTML:  http://tools.ietf.org/html/draft-ibc-rtcweb-sip-websocket-00
  TXT:     http://www.ietf.org/id/draft-ibc-rtcweb-sip-websocket-00.txt

Abstract

   This document specifies a WebSocket subprotocol for a new transport
   in SIP (Session Initiation Protocol).  The WebSocket protocol enables
   two-way realtime communication between clients (typically web-based
   applications) and servers.  The main goal of this specification is to
   integrate the SIP protocol within web applications.

We produced this initial version after implementing a working prototype.

Your feedback is always welcome,
The Authors

-- 
Iñaki Baz Castillo
<ibc@aliax.net>
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