August 2007
Intermediate to advanced
608 pages
20h 33m
English
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Configuring an FXS Channel for an Analog Telephone
The configuration of an FXS channel is similar to that of an FXO channel. Let’s take a look.
Zaptel Hardware Configuration
The following is a minimal configuration for an FXS channel on a
TDM400P. The configuration is identical to the FXO channel
configuration above, with the addition of fxoks=1.
Recall from our earlier discussion that the opposite type of signaling is used for FXO and FXS channels, so we will be configuring FXO signaling for our FXS channel. In the example below we are configuring channel 1 to use FXO signaling, with the kewlstart signaling protocol:
fxoks=1 fxsks=2 loadzone=us defaultzone=us
After loading the drivers for your hardware, you can verify
their state with the use of /sbin/ztcfg -vv:
Zaptel Configuration ====================== Channel map: Channel 01: FXO Kewlstart (Default) (Slaves: 01) Channel 02: FXS Kewlstart (Default) (Slaves: 02) 2 channels configured.
Zapata Hardware Configuration
The following configuration is identical to that for the FXO channel, with the
addition of a section for our FXS port and, of the line immediate=no. The context for our FXS port
is phones, the signaling is
fxoks (kewlstart), and the channel
number is set to 1.
FXS channels can be configured to perform one of two different
actions when a phone is taken off the hook. The most common (and often
expected) option is for Asterisk to produce a dial tone and wait for
input from the user. This action is configured with immediate=no
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.