$ sudo apt-get update
$ sudo apt-get install linphone-nogtk 

linphone-nogtk is installed in your system.

Make ensure the linphone-nogtk package were installed using the commands given below,

$ sudo dpkg-query -l | grep linphone-nogtk *

You will get with linphone-nogtk package name, version, architecture and description in a table

linphone-nogtk package basic information: