1st August 2018 at 13:52 #40217
after long time this has been posted, giving my understanding.
First to clear, conference and ECT both are different concepts.
taking your exmaple, S -> has one out going call to B and incoming call from A.
at this point there is no connection between A and B. Common point is S.
When S do ECT, connection will be established between A and B, and S will be completely out of context.