dahdi-source - 1:2.11.1.0.20170917~dfsg-7 main

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