87BusinessPhone – Dialog 4425 IP Vision
Other Useful Features
Direct Inward System Access (DISA)
If you are working externally and you have the need to make 
business calls, call your company and use the company PBX to 
make an external call to the desired party. You just pay the costs for 
the phone call to your company. The other costs will automatically 
be placed on your extension number or on a special project.
Note: To activate this function, you have to change the 
default Password from 0000 to a personal one. Which code 
to use and how to change it, see section “Change 
Password” on page 67.
You can also divert calls from your office extension to your external 
position, see section “Call Forwarding” on page 48. During the 
procedure you will be prompted for your Password. 
z Enter the public number of your company.
z Followed by the DISA number.
Ask the system administrator for the defined DISA number.
Note: If you want to register the call on an Account 
Number, you should use the Account Number procedure 
before you enter the external number, see section “Account 
Number” on page 88.
z Enter the external number.
Or:
Use the External Diversion function.
Procedure, see section “Call Forwarding” on page 48.
Note: If you program a new diversion address, remember 
to reset it when you return to your office.