Hi, 

>Does normally b2bua handles PRACK ?

I hope so :)

>Problem is if it handles, PRACK may contain SDP offer, that 
>can't be forwarded to otherside of b2bua.
> 
>If not, ... does b2bua just forward PRACH and doesn't 
>implement it at all ?'

If the B2BUA has generated the provisional response which is PRACKed, it
probably won't forward the PRACK.

But, if the B2BUA has forwarded a provisional response it received from
somewhere else, or at least triggered its own provisional response based
on a provisional response it received from somewhere else, I guess it
will also forward the PRACK (or generate a PRACK of it's own).

Regards,

Christer

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