I can not speak to the use of conferencing for that scenario. But, if you are allowing flow to happen after you have dialed a user in Asterisk ('g' option on t

I can not speak to the use of conferencing for that scenario. But, if you are allowing flow to happen after you have dialed a user in Asterisk ('g' option on the Dial command in Asterisk - http://bit.ly/575c6 http://bit.ly/575c6) and the dialed party hangs up, I believe you must be in the media stream.