of real-time transport Protocol in VOIP (RTP)
advent of Voice over IP (VoIP) has given a new dimension to Internet and opened
a host of new possibilities and opportunities for both corporate and public network
planners. More and more companies are seeing the value of
over IP networks to reduce telephone and facsimile costs.
voice to packet networks requires an understanding of how to deal with system
level challenges such as interoperability, packet loss, delay,density, scalability,
and reliability. This is because of the real time constraints that come into picture.
But then the basic protocols being used at the network and transport layer have
remained unchanged. This calls for the definition of new protocols, which can
be used in addition with the existing protocols.
a protocol should provide the application using them with enough information to
conform to the real-time constraints. This paper discusses the significance of
Real-time Transport Protocol (RTP) in VoIP applications. A brief introduction
to VoIP and then a description of the RTP header are given in sections 1-5.
actual realisation of the RTP header, packetisation and processing of an RTP packet
is discussed section six. Section 7, called 'Realising RTP functionalities', discusses
a few problems that occur in a real time environment and how RTP provides information
to counter the same. Finally, sample codes that we wrote for realising RTP packetisation,
processing and RTP functionalities, written in 'C', for a Linux platform are presented.
Please note that RTP is incomplete
without the companion RTP Control Protocol (RTCP), but a detailed description
of RTCP is beyond the scope of this paper.
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