asterisk-dahdi 1:20.4.0~dfsg+~cs6.13.40431414-2 (amd64 binary) in ubuntu mantic

 Asterisk is an Open Source PBX and telephony toolkit.
 .
 This package includes the DAHDI channel driver (chan_dahdi.so)
 and a number of other Asterisk modules that require DAHDI support.
 They will not be useful without kernel-level DAHDI support.
 .
 For more information about the Asterisk PBX,
 have a look at the Asterisk package.