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+The dahdi drivers and binaries are needed to use popular digital and
+analogue telephony equipment and are typically installed alongside the
+asterisk PBX (although these are not required for asterisk if you are
+not using any hardware to interface with the POTS/PSTN system). Note
+that if you change your kernel after installing any dahdi components,
+you'll have to re-compile dahdi-linux (a simple re-install will not
+suffice), but may be able to keep your existing dahdi-tools package.
+
+After installing dahdi-tools, all the modules for digium telephony cards
+will be blacklisted in /etc/modprobe.d/dahdi.blacklist.conf - this is
+intentional to allow you to load modules in a specific order in rc.local.
+
+This requires dahdi-linux.