ZyXEL Communications P-2302HWUDL-P1 Series User Manual

 Chapter 13 VoIP Trunking

P-2302HWUDL-P1 Series User’s Guide

Call rules automate the forwarding of calls, first to a remote peer device and then to PSTN 
phones. This is used when you make frequent calls to several PSTN numbers in the same 
geographic area that start with the same numbers (for example an area code). If there is a 
remote peer device in that area, you can set up a VoIP link to it and have it forward the calls to 
PSTN phones. This works by configuring a pattern that the ZyXEL Device can recognize. A 
pattern is just the initial string of digits shared by the phone numbers. The following table 
shows the relationship between the phone numbers you want to call, the pattern you want to 
configure and the rule you want to set up.

There are several different VoIP trunking scenarios. 

A VoIP phone A makes a call to the ZyXEL Device  B via VoIP. B forwards the call to a 
PSTN phone C. A can be an analog phone connected to the ZyXEL Device or any other phone 
capable of making calls over the IP network.

Figure 96   VoIP Phone To PSTN Phone

Password

passwordA

passwordB

Incoming Authentication

Username

userone

localDeviceA

Password

userpassword

passwordA

Table 79   Matching Incoming and Outgoing Authentication

Table 80   Call Rules

1-555-555-4321

1-555-544-5678
1-555-432-8888

1555

Set up a peer call to a remote peer device to 

forward calls starting with the numbers 1555.

1-111-555-4321

1-111-544-5678
1-111-432-8888

1111

Set up a peer call to a remote peer device to 

forward calls starting with the numbers 1111.