Hi Jean,
I read your other thread on this subject and I see where you are going with this
I think
What you would like, is that if you are replying to a message via press 3 to "Call/Reply"
that after you have engaged this feature the message would automatically be deleted.
If so, there is no setting in Unity Connection that will accomplish this for you. In many
cases people still would like a copy of the original message even though they have spoken with
the caller so there is no way to change this behavior.
Cheers!
Rob