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3. Make outbound call

To make an outbound call, we need to add trunk/service provider first. There are two types of

service provider:

Analog Ports: FXO ports of IP04, connect to local PSTN

VoIP: SIP or IAX trunk, connect to remote SIP/IAX server

In the demo IP04, the port 1 and port2 are configured as FXO ports, port 3 and port 4 are

configured as FXS ports.

When a port is configured as FXO port, the corresponding LED shows RED. When a port is

configured as FXS port, the corresponding LED shows GREEN.

What are FXO and FXS?

FXS (Foreign eXchange Station) is an interface which drives a telephone or FAX machine. FXS

interfaces get phones plugged into them, delivery battery, and provide ringing. FXS

interfaces are signalled with FXO signalling.

FXO (Foreign eXchange Office) is an interface that connects to a phone line. They supply

your PBX with access to the public telephone network. FXO interfaces use FXS signalling. FXS

interfaces are what allow you to hook telephones to your PBX, and FXO interfaces allow you

to connect your PBX to real analog phone lines.

3.1 Make call via PSTN trunk

3.1.1 Add Analog service provider

Service Provider -> Add Service Providers:

We can see that there are two analog ports in our IP04, select them as our analog trunk.

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ATCOM APBX IP02 User Manual Page 15