Page 103 - Asterisk™: The Future of Telephony
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Figure 4-1. A TDM400P with an FXS module (1 across) and an FXO module (2 across)
Be sure to connect your computer’s power supply to the Molex con-
nector on the TDM400P if you have FXS modules, as it is used to supply
the voltage needed to drive the ring generator on the FXS ports. The
Molex connector is not required if you have only FXO modules.
Configuring an FXO Channel for a PSTN Connection
We’ll start by configuring an FXO channel. First we’ll configure the Zaptel hardware,
and then the Zapata hardware. We’ll set up a very basic dialplan, and we’ll show you
how to test the channel.
Zaptel Hardware Configuration
The zaptel.conf file located in /etc/ is used to configure your hardware. The following
minimal configuration defines an FXO port with FXS signaling:
fxsks=2
loadzone=us
defaultzone=us
Configuring an FXO Channel for a PSTN Connection | 75
