3 before you begin, Figure 139 direct example, Figure 140 msn example – ZyXEL Communications IP PBX X6004 User Manual

Page 277: Calling directly to an extension, Msns (multiple subscriber numbers)

Chapter 18 Outbound Line Group

X6004 User’s Guide

277

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 139 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 140 MSN Example

18.1.3 Before You Begin

Before you start to configure an outbound line group, please consider the
following.

• In order to create an FXO/BRI/PRI trunk you must already have a corresponding

interface card installed on the X6004. See the Quick Start Guide for information

on installing your interface cards.

6012

PBX

MSN: 555-123456

555-123456

ISDN BRI

TE mode

Please

extension!

dial

or 555-987654

NT mode

MSN: 555-987654

TE mode

MSN1: 555-123456

MSN2: 555-987654

TSP