$ sudo apt-get update
$ sudo apt-get install dahdi-dkms 

dahdi-dkms is installed in your system.

Make ensure the dahdi-dkms package were installed using the commands given below,

$ sudo dpkg-query -l | grep dahdi-dkms *

You will get with dahdi-dkms package name, version, architecture and description in a table

dahdi-dkms package basic information: