Install dahdi-source by entering the following commands in the terminal:
sudo apt update sudo apt install dahdi-source
Description:
DAHDI telephony interface - source code for kernel driver
DAHDI (formly Zaptel) is an interface for telephony devices used by e.g. 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. . It is normally used to build kernel modules package: m-a a-i dahdi
Homepage: http://www.asterisk.org/
Version: 1:2.11.1~dfsg-1ubuntu4
Section: universe/devel