What is another word for extension phone?
Pronunciation: [ɛkstˈɛnʃən fˈə͡ʊn] (IPA) 
An extension phone, also known as an internal phone, is a telephone unit connected to a Private Branch Exchange (PBX) system. It can be used to make and receive calls within a company or institution. There are several synonyms for an extension phone, including intercom, internal line, desk phone, PBX phone, interoffice phone, and extension line. These terms are used interchangeably and refer to the same type of phone. An extension phone can be located on a desk, mounted on a wall, or even a portable handset. It is an essential tool for internal communication and ensures smooth operation of any organization.
