Hi,

What should be the behavior of UAC when an INVITE is sent without offer and 
Require 100rel and it receives non-reliable/reliable 18x response without SDP?

Should the transaction be terminated by sending CANCEL?

The same scenario was given as comment which has not been addressed in  
offer/answer draft-ietf-sipping-sip-offeranswer-03

http://www.softarmor.com/sipping/process/wg-review/reviews/draft-ietf-sipping-sip-offeranswer-03-seth.txt

" 3.    Section 1.1 :
   Comment :- We should define the behavior for a UAC which sends out an
INVITE without SDP and receives the first non-failure reliable response
without an Offer, due to the UAS not conforming to the draft. As this
being an open point can lead to multiple different implementations. Does
the UAC clear the call or send a PRACK and wait for the offer in
subsequent reliable responses."


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