QX50/QX200/QX2000; (SW Version 6.0.x) 13
QX50/QX200/QX2000 Manual I: Installation Guide
Step 1: Installing the QX IP PBX
QX50/QX200 Networking Overview
To establish a connection between the Internet and your local area network (LAN), a router is
needed. The QX IP PBX can serve, among other functions, as a router and will perform the task
of connecting your LAN, or a group of one or more PCs, to the wide area network (WAN) or the
Internet. The QX IP PBX will process and regulate the data traffic between these two networks.
The QX IP PBX is a device with two sides: one side connects to your LAN, and the other side
connects to the Internet, or to the WAN. QX IP PBX’s firewall and Network Address Translation
(NAT) functionality protects your LAN from being seen from the Internet side making the LAN
private and secure.
Both Ethernet WAN and LAN ports transmit up to 100 Mbps traffic.
Every device within an IP network requires a unique IP address to identify itself. Since the QX
IP PBX connects to both the LAN and the WAN, it has to be part of both networks, and must
have two IP addresses: one for the WAN side and one for the LAN side. The QX IP PBX’s inte-
grated firewall/NAT functionality will hide the LAN IP address from the WAN (Internet) side.
There are two ways of assigning an IP address: statically or dynamically.
A Static IP address is a fixed, manually assigned IP address that remains valid until changed. If
you plan to use the QX IP PBX as your router, contact your Internet Service Provider (ISP) to
find out if a static IP address is assigned to your account. If so, you will need this static IP ad-
dress when configuring the QX IP PBX device.
A dynamic IP address is a temporary address that is automatically assigned by your ISP and
will change periodically. If your ISP offers a dynamic IP address, the QX IP PBX will act as a
DHCP client and will receive a new IP address from the ISP’s DHCP server or PPPoE feature.
Please Note: A DHCP client is a service that requests an IP address from a DHCP server. A
DHCP server assigns on request a unique IP address to a device. The QX IP PBX, like many rou-
ters, acts as a DHCP client on its WAN interface and as a DHCP server on its LAN interface.
The QX IP PBX must be visible to the Internet to be able to receive and send VoIP calls. When
the QX IP PBX is placed in a private network, typically behind existing routers, it will by default
attempt to pass through the NAT of this router with its STUN (Simple Traversal of UDP over
NAT) feature. STUN will work without user configuration with the majority of basic routers. In
some scenarios, port forwarding on the router is required to make the QX IP PBX accessible to
other QX IP PBX devices and the Epygi SIP Server on the Internet. Another configuration option
is to use the QX IP PBX as the router, connected directly to the WAN, eliminating the traverse
to the local NAT firewall.
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