Asterisk: The Future of Telephony, 2nd Edition

Loading Zaptel Modules Without Scripts

In this section, we’ll take a quick look at how to load the zaptel and ztdummy modules without the CentOS initialization script. The zaptel module does not require any configuration if it’s being used only for the ztdummy module. If you plan on loading the ztdummy module as your timing source (and thus, you will not be running any PCI hardware in your system), now is a good time to load both drivers.

Systems Running udevd

In the early days of Linux, the system’s /dev/ directory was populated with a list of devices with which the system could potentially interact. At the time, nearly 18,000 devices were listed. That all changed when devfs was released, allowing dynamic creation of devices that are active within the system. Some of the recently released distributions have incorporated the udev daemon into their systems to dynamically populate /dev/ with device nodes.

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. ...