After you hit the supervised-transfer button the request is immediately send to asterisk, but asterisk waits to complete the number with the transferdigittimeout timer.
You can hit the # on the phone after pressing the supervised-transfer button to stop the waiting and start the dial.
Transferring with Fop2 always have the complete number so asterisk don't have to wait.
Is it possible that Fop2 send a invite with a # at the end on a supervised transfer?
The transferdigittimeout timer can't be set low because the users needs some time to dial the number if they transfer by phone.
I have set it to 2 seconds, a bit short for normal transfers and a bit too long for Fop2 transfers.
Hitting the # on the phone to speed things up after transferring with Fop2 is not a nice solution.
Or is there a solution that I can make in the dialplan?