Which basic mode of communication is used for telephonic conversation?

Hint:A telephone transforms sound, the human voice usually and most effectively, into electronic signals that are transferred to another telephone through cables and other transmission networks, which reproduces the sound to the receiving person.
There are two basic modes of communication:
-Point to point
-Broadcast

Complete step by step answer:
Point-to-point communication: The dedicated communication link between two systems or processes is a point-to – point communication. Like that of a wire which connects two systems directly. The machines use the wire solely to connect.
A telephone call is a point-to - point connection between the two phones that is circuit driven. Calls are typically multiplexed via telephone company trunks, though, although the circuit itself may be virtual, users partake in a point-to - point communication system.An end-to - end communication refers to a communication over a switched network between two networks. The Internet is, for instance, made up of a mesh of routers. From one router to the next, packets follow a hop-by - hop direction to reach their destinations. A physical point-to - point communication between routers consists of each hop. A routed path thus consists of several point-to - point communications.
Broadcast communication: A broadcast communication network is a communication network in computer networking and telecommunications which uses broadcasting for communication between its nodes. They take signals from a single transmitter and relay them to all network endpoints. For example, the radio, TV, etc.

Thus, from the above discussion we can see that the basic mode of communication used for telephonic conversation.

Note:So, in short we can say that communication takes place over a connection between a single transmitter and a receiver in the point-to - point communication mode.