[Sip] B2BUA question.

["Padhye, Chinmay" <chinmay.padhye@intel.com>]

Hello,

	This is from the definition of B2BUA from RFC 3261 -

	'Since it is a concatenation of a UAC and UAS, no explicit definitions are needed for its behavior."
	
	Since the behavior of a B2BUA is the same as the behavior of a UAC/UAS, what was the need for defining a new logical entity - B2BUA? I am trying to understand the motivation behind adding this definition in the RFC.

Regards,

Chinmay
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