ZyXEL Communications ISG50-ISDN User Manual page 480

Chapter 30 Outbound Trunk Group
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.
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 309 Direct Example
MSNs (Multiple Subscriber Numbers)
This feature is relevant to ISDN BRI (TE mode) only. In this example, two ISG50s use a BRI hub to
share a single BRI line to one TSP (Telecommunications Service Provider). Each ISG50 can have up
to 10 BRI trunks for each BRI line it uses. Each BRI trunk uses a unique MSN. This example uses 20
MSNs for the single BRI line. These MSNs must correspond to those configured on the connected
TSP'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 310 MSN Example
MSN1 : 555-100001 ~ MSN10: 555-100010
AA
MSN11 : 555-200001 ~ MSN20: 555-200010
480
ISG
6012
A
TE mode
Please
dial
extension!
BRI Hub
TE mode
6012
TSP
ISDN BRI
NT mode
PBX
MSN1 : 555-100001
MSN10: 555-100010
MSN11 : 555-200001
MSN20: 555-200010
ISG50 User's Guide