$ sudo apt-get update
$ sudo apt-get install jscommunicator-web-phone 

jscommunicator-web-phone is installed in your system.

Make ensure the jscommunicator-web-phone package were installed using the commands given below,

$ sudo dpkg-query -l | grep jscommunicator-web-phone *

You will get with jscommunicator-web-phone package name, version, architecture and description in a table

jscommunicator-web-phone package basic information: