[Simple] Can we deprecate UDP for presence?

[Avshalom Houri <AVSHALOM at il.ibm.com>]

As we know it is not easy to scale
presence.

Since presence RFCs and drafts were
created after RFC 3261 that mandates both 
UDP and TCP support (opposed to 2543
that mandated only UDP), can we say that 
most if not all presence client will
use TCP?

If we could deprecate UDP for presence
then we can think about several traffic 
optimizations where the overhead is
due to the UDP support of SIP?

Comments?

--Avshalom
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