ZyXEL Communications ISG50 User Manual

 Chapter 8 PBX Tutorials

ISG50 User’s Guide

• Like Example 2, you can also select Direct (if you want the callers from the PBX’s extensions to 

the ISG50’s not to go through the Auto-Attendant) or MSN (if you are using BRI line(s) and you 
want to have multiple subscriber numbers on one port).

Note: Like Example 2, we don’t use DDI/DID in this type of example because DDI/DID is 

mainly used for outsiders to call extensions.

The ISG50 has built-in call features for functions such as call forwarding, call blocking, voicemail 
and so on. These features can be activated or accessed by dialing specific numbers from the phones 
connected to the ISG50. The numbers used to access call features are called call feature codes. 
This section shows you how to customize call features. It also describes how to configure a ZyXEL 
IP phone (V300 is used in our example) to access voicemail by using the voicemail feature code. 
See 

 for more information on all call features.

Click Configuration > PBX > Global > Feature Code to display the codes used for the ISG50’s 
call features. You can change the codes in this screen. Provide the users with a list of the features 
and corresponding codes. Users on your network can then dial a code from their telephone to 
activate a specific feature. For example, dialing *96 transfers a call. 

Server > Feature Code

The voicemail feature code as assigned in 

 is **. Users can dial ** 

followed by their extension number to access their voicemail. For example, a caller from extension 
1001 can dial **1001 to access voicemail messages.

Some IP phones allow you to configure automatic dialing of feature codes to perform common 
tasks. See your phone’s documentation for details.