Install isdnlog-data by entering the following commands in the terminal:
sudo apt update sudo apt install isdnlog-data
Description:
ISDN utilities - connection logger data
This package provides data related to call pricing, area codes, etcetera, in various countries, and is only useful with isdnlog.
Homepage: https://www.isdn4linux.de
Version: 1:3.25+dfsg1-9ubuntu2
Section: universe/utils