1) Call centre : It is a third party company and its main aim is to serve the public for the payment of bills, purchase of goods, doubt clearance, etc. Here Telephone facility is set up to handle incoming and out going calls about goods or service for an organisation.
2) Teleconferencing : It is a Way of conferring, discussing or communicating by audio and video circuits, by a group of people located in geographically distributed areas. There are two types of conferencing video and audio. In audio conferencing the participants can’t see each other but only hear voices of one another.
3) Video conferencing : It is a type of Teleconferencing. The participants can see each other live on screen and can speak to each other with the help of teleconferencing. They must be sit in conference rooms connected through a teleconference system(A video camera and a speaker phone are connected to a computer with Internet connection)