ZyXEL Communications IP PBX X6004 - Manual (Page 275)

Chapter 18 Outbound Line Group
X6004 User’s Guide
275
Using Multiple ISDN Numbers
You may have multiple ISDN numbers from your ISDN service provider. You can
map these numbers to the AA (Auto Attendant) and directly to extension
numbers.
Note: Use AA if you do not have multiple ISDN numbers.
AA (Auto Attendant)
After calling the number, the caller is prompted to dial the extension number.
Figure 137 Auto Attendant (AA) Example
DDI (Direct Dial In)
DDI (also called DID, Direct Inward Dial) is a feature that maps a public number
to an extension number. DDI enables a caller to call an extension number without
going through an operator. When people give out their contact number and say
it's a “direct line”, often what they mean is that it's a DDI number.
For example, your company has 10 phone numbers (555-123456~555-123465).
You can choose 555-123456 to be the directory number (the company’s
representative phone number) and map the others to extensions using DDI.
ISDN
Please
extension!
dial
6 0 1 2
555-123456
6012
AA