To install dahdi-source just follow these instructions.
sudo apt-get install dahdi-source
Which will install dahdi-source and any other packages on which it depends.
|Maintainer||Debian VoIP Team <[email protected]g>|
|Description||DAHDI telephony interface – source code for kernel driver the Asterisk PBX software. The dahdi-* packages provide the kernel DAHDI kernel modules and their required setup environment, as well as basic headers for building DAHDI modules and utilities.|