| Summary: | In this time the Internet is not only used for sending data files or
accessing a web site, but have been able to cater for multimedia applications such
as video conferencing or Voice over Internet Protocol (VoIP). VoIP technology
allows voice communication is done by utilizing the Internet media. VoIP
applications generally run on UDP protocol. Increased use of VoIP protocols
running on top of protocol that does not implement congestion control mechanism
causes the Internet prone to congestion collapse.
Datagram Congestion Control Protocol (DCCP) is a transport protocol
designed for multimedia Internet applications. This protocol has several
congestion control mechanisms and can be selected according to application
characteristics. CCID4 is a congestion control mechanism suitable for use with
VoIP applications to send a small packet. CCID4 enforces a minimum interval of
10 milliseconds between data packets. This study conducted an analysis of
DCCP/CCID4 protocol to determine the quality of VoIP that uses the protocol,
comparing the quality produced by the used of UDP protocol, and see the quality
of TCP flow as a result of the presence of the VoIP flow on the network.
The simulation results show the quality of VoIP tend to do better by
using the UDP protocol compared with DCCP/CCID4 when there is no TCP flow
on the network. Conversely, when there are TCP flows, the quality of VoIP with
DCCP/CCID4 protocol better than UDP. DCCP/CCID4 managed to prevent the
congestion collapse compared with the use of UDP. In addition, the TCP quality
is better when DCCP/CCID4 protocol used for VoIP applications that
experiencing network congestion.
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