To get you started you can create a VMP module and add a Menu with DTMF sequence of 91?????????? then connect it to a transfer to $KEY.
I would typically put a check digit action before that to keep the random dialer out of the system and help reduce the potential for toll fraud.
Kyle Holladay
Certified: ACACN, ACSCI, ACSCM, TIA-CTP
ACE Implement: IP Office
"If it worked the way it should you wouldn't need me