"Digital telephone" is the term used to describe a phone that uses digital signals to transmit voice and data. However, there are several other terms that can be used interchangeably with the term digital telephone. These include "IP phone," "internet phone," and "VoIP phone." IP phones use Internet Protocol (IP) to transmit voice and data, while internet phones use the internet for the same purpose. VoIP phones, on the other hand, use Voice over Internet Protocol technology to make calls over an internet connection. All these terms are commonly used to describe digital telephones, which are increasingly becoming the preferred mode of communication for businesses and individuals alike.