Figure 188 Direct Example - ZyXEL Communications X6004 User Manual

Chapter 17 Outbound Line Group
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.
Calls on incoming ISDN numbers that are not included in the DDI mapping
table go to the AA.
Calling Directly to an Extension
ISDN calls can be made directly to an extension number from another PBX that is connected
directly. In this example, all incoming calls are forwarded to the extension called.

Figure 188 Direct Example

MSNs (Multiple Subscriber Numbers)
This feature is relevant to ISDN BRI (TE mode) only. In this example, two X6004s are
connected through a single BRI line to one TSP (Telecommunications Service Provider). Each
X6004 has a unique MSN. These MSNs must correspond to those configured on the connected
ITSP's ISDN device. Device A's auto-attendant system answers the incoming call only when
the number matches the MSN configured on device A.
Figure 189 MSN Example
206
6012
MSN: 555-123456
A
TE mode
Please
AA
dial
extension!
TE mode
MSN: 555-987654
6012
PBX
MSN1: 555-123456
MSN2: 555-987654
555-123456
or 555-987654
TSP
ISDN BRI
NT mode
X6004 User's Guide