RE: [Sip] Question about Poll: Proposal relating to keepalive, TCP, and UDP usage in draft-ietf-sip-outbound

["Brian Stucker" <bstucker at nortel.com>]

> -----Original Message-----
> From: Erkki.Koivusalo at nokia.com [mailto:Erkki.Koivusalo at nokia.com] 
> Sent: Tuesday, January 02, 2007 1:41 AM

<<snip>> 

> As a summary what that would mean in terms of deployments:
> 
> - Every Outbound compliant (UA or proxy) implementation MUST
>   support TCP but MAY support UDP too.

May support UDP for Outbound, or may support UDP, period? Unless I'm
missing something somewhere, section 18 of RFC-3261 still says that all
SIP elements MUST implement UDP.

> 
> - It will be up to the deployment to select whether TCP or UDP
>   (or even both) shall be used for that specific deployment.
>   Supporting UDP only would have known limitations and it would
>   also mean that TCP-only implementations could not be used for
>   that deployment.
> 
> Erkki 

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