> 1- Where can I get an standard explanation (draft) 
> about b2bua 

RFC 3261 section 6.

> 2- The differences between a "sip proxy" 
> and "b2bua"

It varies because there are numerous varieties of b2bua's.

You can easily search some of the email archives 
concerning the b2bua variations and discussions 
by google searching the following: 
site:www1.ietf.org "sip-mailing-list" b2bua


The following link should also help:

http://www1.ietf.org/mail-archive/web/sip/current/msg07071.html



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