Direct Inward System Access (DISA)

Concept

The DISA (Direct Inward System Access) application requires a user to enter an extension number and password/PIN before placing a call. It is useful to allow someone from outside the telephone switch (PBX) to obtain an internal system dial tone and to place calls from it as if they were placing a call from within the switch. This feature is useful for employees working outside the office as it allows them to conduct business without revealing their home or cell phone numbers. It is also useful to block international calling for all users without a password/PIN.

How it works

The DISA app will ask a caller for their extension number (Account) and numeric passcode (Voicemail PIN). If the passcode is correct, the user is then asked to enter a mailbox number. From here the caller may dial any internal or external number. Numbers will be routed based on the User's Dial Permission. For example, if the User's profile allows only US calls, then the caller will only be able to make US calls.
Outbound calls from the DISA app will contain the Caller ID Number and the Caller ID Name of the User whose credentials were entered.

Usage

To use this feature:

• Call into the auto-attendant from any off-net telephone and choose the Auto Attendant option that will connect you to the DISA User.
• The system will ask you to "Please enter your account number." Enter the extension number of any User within the same domain as the Auto Attendant.
• The system will ask you to "Please enter your password followed by the pound key." Enter the voicemail PIN for the User previously selected.
• The system will ask you to "Please enter the destination mailbox." Dial the destination number of the party that you wish to reach. The system will dial the desired number as if it were being called from the User's extension. That means that outbound calls from the DISA app will contain the Caller ID Number and the Caller ID Name of the User whose credentials were entered.

Options

It is also possible to implement the DISA feature by routing a DID directly to the DISA User. This method would allow calls to bypass the initial step navigating through the Auto Attendant.

You may also access voicemail through DISA which gives you the following menu options. (Click image to enlarge)