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3CX Phone System for Windows System for Windows
Page 27
4. Adding PSTN line(s) via a VOIP Gateway
Introduction
External calls are received and made on PSTN phone lines.
A traditional PBX requires
you to connect the PSTN lines to the PBX hardware box; however in the case of 3CX
Phone System you have more options:
Connect PSTN lines (physical phone lines) to a VoIP Gateway situated on your
internal network.
Use a ‘hosted’ phone line from a VOIP Service Provider. In this case the VOIP service
provider has connected external lines to a VOIP Gateway and allows you to access
these lines via your internet connection.
To make & receive external phone calls via your regular phone lines, you will have to buy
and configure a VoIP gateway. This chapter explains VoIP Gateways and how to
configure them.
What is a VoIP Gateway?
A VoIP gateway is a device which converts telephony traffic into data,
so that it can be
transmitted over a computer network. In this manner PSTN/telephone lines are
“converted” to SIP
extensions, allowing you to receive & place calls via the regular
telephony network. VOIP Gateways exist for analog lines as well as BRI, PRI/E1 lines
and T1 lines
There are lots of VoIP gateways available today at competitive prices. Analog VOIP
gateways start at as little as $100. Be sure to use a supported gateway
-
a list of
supported gateways can be found on http://www.3cx.com/voip-gateways/index.html.
VOIP Gateway configuration overview
Just as it is necessary to configure a phone to register with the phone system, it is
necessary to configure the VoIP gateway to register its lines with 3CX Phone System.
Each line gets a SIP user ID & Password, and to the IP PBX, the PSTN line appears just
like any other SIP extension.
In the next sections we will now describe step by step how to configure a VOIP Gateway
for use with 3CX Phone System.
Step 1: Create the PSTN lines in 3CX Phone System
The first step is to create the PSTN lines in the 3CX management console. Each PSTN
Line will become a virtual extension and be assigned a virtual extension number,
authentication ID and authentication password. To add PSTN lines to the 3CX phone
System;