EP302

 TELEPHONY                                   

 Types of telephone network

A fixed line network

-          Where the telephones must be directly wired into a single telephone exchange. This is known as the public switched telephone network or PSTN.

A wireless network

-          Where the telephones are mobile and can move around anywhere within the coverage area.

A Private Network

-          Where a closed group of telephones are connected primarily to each other and use a gateway to reach the outside world.

-          This is  usually used inside companies and call centres and is called a Private Branch Exchange (PBX)

Voice over IP (VoIP, or voice over Internet Protocol) commonly refers to the communication protocols, technologies, methodologies, and transmission techniques involved in the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet.