ZyXEL Communications ISG50 User Manual

 Chapter 33 Group Management

ISG50 User’s Guide

Note: You must also configure auto-attendant settings before calls coming in from outside 

lines can call the extensions created on the ISG50. See 

The following example shows a configuration with three outbound line groups. ITSP represents a 
SIP trunk to your VoIP service provider. PSTN represents a link to your local traditional telephone 
service provider and TrustedPeer is a connection to your branch office. Incoming calls from 
ITSP and from PSTN are allowed to only reach extensions of your sales team (AG1). Calls 
coming in from TrustedPeer are allowed to reach the extensions of both the sales (AG1) and 
research (AG2) departments. This configuration is accomplished by removing the association to 
AG2 from the ITSP and PSTN outbound line groups. 

Group Management - Outbound Line Group to Authority Group   

• LCRs (LCR is the outbound dialing rule) - When you create links from an outbound line group to 

an LCR, you allow incoming calls from that outbound line group to make outbound calls via the 
outbound line groups configured in the LCR. For example, someone calling from outside your 
organization can use the ISG50 to forward their call to another outside line.
In the following example, outbound line group TrustedPeer is associated with LCR1. LCR1 is 
comprised of two outbound line groups: a SIP trunk to your VoIP service provider - ITSP and a 
connection to your local traditional telephone company - PSTN/ISDN. Calls coming in via the 
TrustedPeer connection can use the ITSP and PSTN/ISDN connections to complete their calls.

Group Management - Outbound Line Group to LCR