> The question is - In response to the last offer by UA3, 
> what should the UA2's reply? 

It should comply with RFC 3264.


> Can it send the same SDP that it had sent in step 2?

If it complies with RFC 3264, yes.


> My concern is, if it does so, wouldn't UA3 discard it as a duplicate SDP ?

It is not to be discard; it indicates that there isn't an SDP change associated 
with this answer (or this offer within other situations).


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