@progs_00 If you have applied and/or received the Incredible PBX patch from the previous page, then the Dial Options are set to tr which means that, for calls ringing internal phones, only the called party can transfer a call. The Trunk Options are set to blank which means neither party can transfer a call when a call is handled by an Outbound trunk. Again, *2 is the problem because when the bad guy has permissions to transfer a call, it means he can do a transfer without the other party hearing what's going on. With ##, if the bad guy has permissions, he still could transfer the call, but the other party would hear what was going on and would know the call was being transferred. Thus, the victim need only hang up.
And, no, in more recent versions of FreePBX, you can't transfer a call while an IVR session is underway. IVRs respond to one digit keypresses only.