Individual using an IP phone connected to his desktop computer to participate in office communications.

IP Phone Propels Office Communications into the Internet Era

An IP phone is a desktop phone that replaces the analog copper wire telephone with a digital signal thus making it an extension of the internet, office software, and all that offers.
Man using a laptop to connect to coworkers. IP phones can connect to any device so you can be reached anywhere.

The Trend Toward IP Phones May Be Leaving Your Business Behind

Any growing business should be upgrading any old phone systems to IP Phones, the ones powered through Voice Over Internet Protocol, or VoIP.