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VoIP (voice over IP - that is,
voice delivered using the Internet Protocol) is
a term used in
IP telephony for a set of facilities for
managing the delivery of voice information using
the Internet Protocol (IP).
In general, this means sending voice information
in digital form in discrete packets rather than
in the traditional circuit-committed protocols
of the public switched telephone network (PSTN).
A major advantage of VoIP and Internet telephony
is that it avoids the tolls charged by ordinary
telephone service.
In addition to IP, VoIP uses the
real-time protocol (RTP)
to help ensure that packets get delivered in a
timely way. Using public networks, it is
currently difficult to guarantee Quality of
Service (QoS).
Better service is possible with private networks
managed by an enterprise or by an Internet
Telephony Service Provider (ITSP).
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VoIP Calling 