RE: [Sip] moving UDP support out of the core SIP document

["Victor Paulsamy" <victor@zapex.com>]

If SIP is "truly" independent of underlying transport protocols, wouldn't it
be appropriate to make all transports "optional"?

Regards,

--victor

> -----Original Message-----
> From: sip-admin@ietf.org [mailto:sip-admin@ietf.org]On Behalf Of Rohan
> Mahy
> Sent: Wednesday, October 23, 2002 11:02 AM
> To: sip@ietf.org
> Subject: [Sip] moving UDP support out of the core SIP document
>
>
> Hello Everyone,
>
> I wanted to share some thoughts that I had about removing UDP from the
> core SIP document when we go to draft standard. We are probably at
> least one year away from going to Draft Standard. I hope that during
> this time most implementations will support RFC3261, and therefore
> support TCP.  In addition, it is quite likely that when moving to Draft
> Standard that the IESG will REQUIRE TLS support on SIP User Agents.
> This would ensure a ubiquitous hop-by-hop channel security mechanism,
> but which requires a reliable transport (TCP or SCTP).
>
> Obviously UDP is still very attractive in wireless networks (due to RTT
> issues) and in other typically private networks with well-understood
> delay and loss characteristics. To make most implementations simpler
> however, I am proposing that we make unreliable transports (UDP and
> DCCP) of SIP optional in User Agents, and that we put the UDP-specific
> mechanism (ex: much of the complication of the transaction layer for
> handling retransmissions) in a separate Draft Standard document.  It is
> very likely that if we did this there would also be a baseline security
> mechanism for UDP as well (probably some profile of IPsec).  The net
> effect is that SIP User Agents could also talk to each other using TCP
> or TLS+TCP, and that User Agents with a strong preference for UDP would
> have a consistent security mechanism.  Proxies would still support both
> transports, so you could easily communicate between a TCP-only User
> Agent, and as User Agent which prefers UDP without requiring the User
> Agent to switch over to TCP.
>
> I welcome your discussion and comments on this idea.
>
> thanks,
> -rohan
>
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