Real Time Transport Protocol (RTP) is used to facilitate real-time data transfer. It enables Voice Over Internet Protocol (VoIP) communication by transporting data flow through two ports in real time.
RTP is a protocol, which is a set of rules used to transfer data between computers or devices. VoIP uses a combination of protocols to transmit the phone data between computers or from a computer to a mobile or land-line phone.
VoIP data is changed from an analog signal to a digital signal. Layered protocols transfer, receive and interpret the signal. RTP is a part of the transport layer.
RTP works in conjunction with the User Datagram Protocol (UDP) to transfer the message. The UDP protocol is used in VoIP communications because it transfers data rapidly.
Voice data is inserted into data packets using the RTP protocol. The RTP packets, enclosed inside the UDP packets, are then transmitted to the receiving instrument or computer.
When the data packets reach the receiving computer, an application layer interprets the signal. The data is then presented to the user as a voice message through earphones or a USB telephone.
VoIP communications require the use of several protocols in order to provide clear communication. Some of these include Quality of Service protocols (QoS) and Session Initiation (SIP) protocols.
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