Phone

Use as a synonym for telephone. Do not use as a verb. Use call instead.

You can dial in to the meeting from any phone.

Add a phone number to your account.

Deskphone

Use to refer to Avaya tabletop or hard phone telephony devices.

Avaya J189 IP Phone

Mobile device, mobile phone

Use to refer to a cell phone or smartphone.

Install the app on your mobile device.

Softphone

Use to refer to any telephony application that is installed on a computer.

Use a softphone on your computer to make and answer calls.

IP phone

Use to refer to any phone that sends traffic over a TCP/IP network. IP phones are typically used for VoIP applications.

IP phones take full advantage of converged voice and data networks, while retaining the convenience and user-friendliness that you expect from a business phone.