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Motivations
Many B2BUAs (SBCs, ASs) deployed
No IETF documentation on the subject
Same as NAT situation before BEHAVE WG
Many interoperability problems
Many questions on sip-implementors list

Complex topic:
Do not advocate B2BUAs …
But give some "BCP" to at least enhance the situation for some types of B2BUAs.
PPT Version