What is 1511 PIN feature?

ZONE Telecom > Business > 1511PREMIUM
1511 PIN feature refers to 3 to 6 digits codes which can be assigned to a user (or group of users) to restrict 1511 access.  Each PIN assigned is linked to a telephone number or a group of telephone numbers.
When dialing 1511 + Country code + Area Code+ Local No., the system will prompt for the PIN before the call is connected. 
After you have assigned Telephone PINs to an account, our system will prompt the user(s) to enter the correct Telephone PIN each time a call is made using 1511.
Note that once you have registered a Telephone PIN for an account, all users using the account's registered numbers will be required to use their assigned PINs.