Install isdnvboxclient by entering the following commands in the terminal:
sudo apt update sudo apt install isdnvboxclient
Description:
ISDN utilities - answering machine client
Let your Debian system be your answering machine! Messages can be accessed remotely, automatically emailed, etc. . This package provides the vbox client, with which you can listen to the messages recorded by a vbox server (either running on the same machine or accessible over the network).
Homepage: https://www.isdn4linux.de
Version: 1:3.25+dfsg1-9ubuntu2
Section: universe/utils