User manual

www.atcom.cn
24/40
6. DISA
DISA (Direct Inward System Access) allows someone calling in from outside the telephone
switch (PBX) to obtain an "internal" system dialtone and dial calls as if from one of the
extensions attached to the telephone switch. Frequently the user calls a number DISA
number with invokes the DISA application. The DISA application in turn requires the user to
enter his passcode, followed by the pound sign (#). If the passcode is correct, the user will
hear dialtone on which a call may be placed. Obviously, this type of access has SERIOUS
security implications, and GREAT care must be taken NOT to compromise your security.
If the password parameter is "no-password", then the DISA application will provide dial tone
without first requiring a password. Obviously, this should only be done if the user's identity
has already been proved by some other means or the set of numbers which can be dialed is
tightly controlled.
DISA(passcode[|context])
DISA(password file)
Below is a simple example guide for DISA:
Voice Menus
Add a new voice menu “DISA”
After the “Answer the Call”
Add a new step:
Step name: Disa
Step content: no-passoword|numberplan-custom-1 // numberplan-custom-1 means:
DialPlan1.
In the incoming rule, route the incoming call this disa entry.
Then when you dial a call to your PSTN line, you will be promoted a second dial tone which
indicates you can add as an internal extension and make outbound call.