Page 84 - Asterisk™: The Future of Telephony

To allow Zaptel and other device drivers to access the PCI hardware installed in your
system, you must add some rules. Using your favorite text editor, open up your
udevd rules file. On CentOS, for example, this file is located
at /etc/udev/rules.d/50-udev.rules. Add the following lines to the end of your rules file:

# Section for zaptel

device
KERNEL="zapctl", NAME="zap/ctl"
KERNEL="zaptimer", NAME="zap/timer"
KERNEL="zapchannel", NAME="zap/channel"
KERNEL="zappseudo", NAME="zap/pseudo"
KERNEL="zap[0-9]*", NAME="zap/%n"
Save the file and reboot your system for the settings to take effect.

You may not have to actually edit anything in your system, as the Zaptel
installation script will try to install the rules for you; however, we have
left this here as a reference for those systems that are not automatically
configured.

Loading Zaptel

The zaptel module must be loaded before any of the other modules are loaded and used.
Note that if you will be using the zaptel module with PCI hardware, you must config-
ure /etc/zaptel.conf before you load it. (We will discuss how to configure zaptel.conf for
use with hardware in Chapter 4.) If you are using zaptel only to access ztdummy, you
can load it with the modprobe command, as follows:
# modprobe zaptel
If all goes well, you shouldn’t see any output. To verify that the zaptel module loaded
successfully, use the lsmod command. You should be returned a line showing the
zaptel module and the amount of memory it is using, as in the following:
# lsmod | grep zaptel
zaptel 201988 0

Loading ztdummy

The ztdummy module is an interface to a device that provides timing, which in turn
allows Asterisk to provide timing to various applications and functions that require it.
Use the modprobe command to load the ztdummy module after zaptel has been loaded:
# modprobe ztdummy
If ztdummy loads successfully, no output will be displayed. To verify that ztdummy is
loaded and is being used by zaptel, use the lsmod command. The following output is
from a computer running the 2.6 kernel:

56 | Chapter 3: Installing Asterisk