ZyXEL Communications ISG50 User Manual

Chapter 30 Outbound Trunk Group

ISG50 User’s Guide

BRI Trunk - Add/Edit: Direct

Each field is described in the following table.

BRI Trunk Add/Edit

General Settings

Trunk Name

Type the name of this BRI interface. This field can be 1-30 alphanumeric characters (A-Z, 
a-z, 0-9) and underscores (_). The first character must be a letter.

Description

Type the description for this BRI interface. This field can be 0-63 alphanumeric characters 
(A-Z, a-z, 0-9), underscores (_), hyphens (-) and spaces. 0 means this field can be left 
blank.

Option

Specify the service type for this BRI trunk. 

Select DDI/DID (Direct Dialing In) when you want people to use a “direct number” to 
dial an outgoing call. You can also specify a prefix number in the caller number that might 
be required by your telephone company for outgoing calls using DDI/DID. See 

Select AA (Auto-Attendant) to switch all calls coming through this interface to the Auto-
Attendant system first. See 

 for more information.

Select Direct to forward all calls coming through this interface from trusted callers to 
extensions. See 

Select MSN (Multiple Subscribe Number) to switch all the calls to MSNs coming through 
this interface to the Auto-Attendant system first. See 

 for more information.

Directory Number Enter your ISDN number registered to your telephone company. This number is used for 

the caller number when you make an outgoing call through the trunk from the extension 
which cannot be found in the DDI mapping table. This field can be 3-20 digits in length.