Apple Script Address Book Calling

Question

Hopefully someone can help me because i am beating my head against the wall. I am trying to make a script that allows me to call a number in Address Book in my Avaya Softphone app. Everything works great except that all numbers need to have "9-1" or "91" before the phone number. This is needed to access the outside line and all calling requires the country code.
I can not figure out how to add the 91 to the script so that all phone numbers in the script have this added.
PLEASE HELP!
HERE IS THE CODE
HOW DO I DO THIS?
property popupEntry : "Avaya"
using terms from application "Address Book"
          on action property
                    return "phone"
          end action property
          on action title for p with v
                    return popupEntry
          end action title
          on should enable action for p with v
                    return true
          end should enable action
          on perform action for aPerson with aProperty
                    set phoneNumber to value of aProperty
                    tell application "Softphone"
  dial number of phoneNumber
                    end tell
          end perform action
end using terms from

Answer 1

I don't have your Softphone app, so I'm assuming that the script works to the point of dialling, and it's just the '9-1' prefix you need to add, in which case it should be as easy as replacing:
                    set phoneNumber to value of aProperty
with:
                    set phoneNumber to "9-1" & value of aProperty