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

["Francois Audet" <audet at nortel.com>]

> 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.

Personally, I think that it would be better if Outbound-compliant
UAs (but not Proxies) also had to support UDP.

But I can certainly live with either decision.


> - It will be up to the deployment to select whether TCP or UDP
>   (or even both) shall be used for that specific deployment.

Correct. A SIP service provider could decide to support TCP or UDP
(or both) as they see fit for their deployment.

Since clients would support both, it would be entirely a service 
provider decision.

>   Supporting UDP only would have known limitations and it would
>   also mean that TCP-only implementations could not be used for
>   that deployment.

To me, it's more a question of UDP not working in many cases where
fragmentation may be an issue. 

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