then I can do it too, because I can spoof caller ID's from my SIP lines
I missed why you can't do the DISA module?
Do you have Voicemail Pro on your system? Then make a point in your auto attendant and send that to a menu that has $ as the only entry and send that to a transfer that has $KEY as target. Password protect the menu that has the $ with digits of your choice and you should be ok.
The way it works is you dial the auto attendant then press the number to get to the menu, enter the password and then enter the number you want to dial.
Joe W.
FHandw., ACS
If you can't be good, be good at it!