Chapter 1 Introducing the Zyxel Device
AX/DX/EX/PX Series User’s Guide
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1.2.4 VoIP Applications
The Zyxel Device’s VoIP function allows you to register up to two SIP (Session Initiation Protocol) accounts
and use the Zyxel Device to make and receive VoIP telephone calls. The Zyxel Device sends your call to
a VoIP service provider’s SIP server which forwards the calls to either VoIP or PSTN phones.
Figure 6 VoIP Application
1.2.5 Zyxel Device’s USB Support
The USB port of the Zyxel Device is used for cellular WAN backup, file-sharing, and media server.
Cellular WAN (3G/4G) Backup
Connect a supported cellular USB dongle with an active SIM card to the USB port. This adds a second
WAN interface and allows the Zyxel Device to wirelessly access the Internet via a cellular network. The
cellular WAN connection is a backup in case the DSL/Ethernet/Fiber connection fails.
To set up a cellular connection, click Network > Broadband > Cellular Backup.
To update the supported cellular USB dongle list, download the latest WWAN package from the Zyxel
website and upload it to the Zyxel Device using the Maintenance > Firmware Upgrade screen.
Figure 7 Internet Access Application: Cellular WAN
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