Hello implementors

I have a flow where
"re-INVITE" with new offer, receives a 200OK with invalid answer.
Should A side send ACK and BYE or just BYE?

Thanks
Manolis

============================================
flow

-------->
INVITE
<--------
200OK
-------->
ACK

-------->        SPD re-offer
re-INVITE
<--------        SDP answer with error
200OK
-------->        is this correct? shouldn't there be an ACK before the BYE?
BYE

============================================
suggested correct flow

-------->
INVITE
<--------
200OK
-------->
ACK

-------->        SPD re-offer
re-INVITE
<--------        SDP answer with error
200OK
-------->       acknowledge the 3 way handshake
ACK
-------->       then terminate the session with Reason Header
BYE


Thanks
Manolis
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