Update to this. Originally the customer wanted DISA for the sole purpose of calling into the system and making a page. He wanted this password protected. What we did was setup a did that routes to a station group with a virtual port . That grp is fwd after 1 sec to vm. The call hits a menu that says enter password(for this example we will use 1234 as the pw).When the call hits the first menu its tell him to enter a pw - he hits 1 (goes to 2nd menu),then 2(goes to third menu) then 3 (goes to the 4th menu) then 4 (once he presses 4 this completes the so called password). Once the 4 is pressed it goes to a message that tells him to record his page. When he completes his page, the vm system will disconnect the call and then do an all call page with the recorded page. There was a scenario in the manual called "delayed page" which actually worked out great for this cust. Just wanted to let you all know in case this ever comes up again. Thanks to all who replied.
