Нюансы версии DAHDI в зависимости от версии ядра Линукса

Which version of DAHDI to use depends on the Linux kernel version, as given by "uname -r". Roughly, Linux kernel 3.x should use DAHDI 2.9, kernel >=4.0 and < 4.15 should use DAHDI 2.11, and kernel >= 4.15 or greater should use DAHDI 3.x.

Отсюда.