ZyXEL Communications P-2302HWUDL-P1 Series User Manual

Chapter 1 Introducing the ZyXEL Device

P-2302HWUDL-P1 Series User’s Guide

• Calls via a VoIP service provider (B) - The ZyXEL Device sends your call to a VoIP 

service provider’s SIP server which forwards your calls to either VoIP or PSTN phones.

VoIP trunking allows you to use your ZyXEL Device as a gateway between VoIP and PSTN 
networks.

Figure 2   ZyXEL Device as a VoIP Trunking Gateway

In this example, you use your analog phone (A) to call the ZyXEL Device (B). The ZyXEL 
Device changes the call into VoIP and sends it via the Internet to another VoIP phone(C).

Your ZyXEL Device has a built in Digital Enhanced Cordless Telecommunications (DECT) 
base station. DECT is an ETSI (European Telecommunications Standards Institute) standard 
for digital cordless phones which specifies how they transmit, receive and process data and 
voice communication. You can register any DECT GAP phone with the ZyXEL Device. 

Figure 3   DECT Base Station Feature

You can use your DECT phone to make calls to other DECT phones registered with the 
ZyXEL Device (A). These calls are referred to as internal calls. 
You can also use your DECT phone to make VoIP calls (B). For the PSTN models, you can 
also make calls via the PSTN line (C). These types of calls are referred to as external calls.