If you have an existing page, meaning you can simulate what you want to do from an internal extension, then the answer is yes.
I've had a bit of fun with this years and years ago.
Set up an independent account code at least 8 digits long.
Create a DISA DID number that requires an account code.
Dial the DID, wait for dial tone, enter account code + '#' and then your access code for your page system.
Remember, DISA is a security hole. Use it with caution.
Ralph