Individuals and companies are increasingly relying on VoIP
(Voice over Internet Protocol) for personal and business communications.
VoIP is not simply another new technology that
makes traditional telephone calls less expensive, but rather
a fundamentally disruptive one. It turns speech into digital
data packets that can be stored, searched, manipulated, copied,
combined with other data, and distributed to virtually any device
that connects to the Internet. The flexibility and efficiency
of VoIP quickly brings together the power of communications
and business applications in a new and exciting manner. It is
no surprise that the worldwide VoIP service revenue surged
by 52% to 24.1 billion USD in 2007 [1].