ZyXEL Communications X6004 User Manual page 260

Chapter 18 Outbound Line Group
Define 2 digits (from right to left) for the DDI mask. Associate "57" to an
extension number (for example, 1111).
Figure 138 DDI Example
This example also shows three call examples.
A - When an outsider calls 555-123457, the call is mapped to the extension
1111.
B - When someone makes an outgoing call from the extension 1111, the caller ID
shown to the callee is 555-123457.
C - When you make a call over this outbound line from an extension that is NOT
listed in the DDI mapping table, the directory number (555123456 in this
example) is the number that displays on the callee's caller ID.
Note: Calls on incoming ISDN numbers that are not included in the DDI mapping table
go to the AA.
260
DDI Mask = 2
... So, DDI Number = 57
DDI Mapping Table
08
1234
BRI/PRI
Caller number: 999654321
Callee number: 1111
Caller number: 1111
Callee number: 999654321
Caller number: 7777
Callee number: 999654321
ISDN
A
Caller number: 999654321
Callee number: 555123457
B
Caller number: 555123457
Callee number: 999654321
C Caller number: 555123456
Callee number: 999654321
999654321
X6004 User's Guide