ZyXEL Communications ISG50 User Manual

Chapter 34 Call Services

ISG50 User’s Guide

The following table describes the labels in this screen. 

The ISG50 allows you to specify and give higher priority to emergency calls to emergency services. 
You can configure a list of emergency phone numbers, for example police or fire department, on the 
ISG50. The ISG50 recognizes when an emergency number is dialed and tries to send the call to the 
configured destination number. If all the lines on the ISG50 are busy, the ISG50 frees up a line by 
hanging up an existing conversation and then passing the emergency call to the destination 
number. 

An FXO or BRI outside line has higher priority than a SIP trunk for emergency call use.

Click Configuration > PBX > Call Service > Emergency Call to view the following screen.Use 
this screen to manage emergency call numbers on the ISG50. 

Configuration > PBX > Call Service >Emergency Call 

Configuration > PBX > Call Service > Call Waiting Setting

Extension Pool / 
Enabled 
Extension

Call waiting applies to the extensions you move to the Enabled Extension list.

To add an extension, select it in the Extension Pool field and click the Right button (to 
add it into the Enabled Extension list). You can remove extensions from the enabled list 
by selecting them and clicking the Left button.

Apply

Click this to save your changes and to apply them to the ISG50.

Reset

Click this to set every field in this screen to its last-saved value.