For telecommunications, with Internet
protocol (IP), Voice over IP (VoIP) becomes
the modern telecommunication. It has many
advantages for businesses, consumers and
services providers [10]. The biggest advantage of VoIP for general users/consumers is
extra-low rates for international calls.
Therefore, e-commerce customers could use
VoIP to contact suppliers and enquire about
delayed goods or any other issues from the
merchant directly if he/she did not get a
reply from e-mailing. Another example
would be eLearning students using Voice
over IP (VoIP) to talk and discuss with
classmates and/or the instructors who live in
a different city/country easily.
Focusing on telecommunications that
are necessary to support a lot of activities,
this paper presents the study of VoIP, and
covers the voice quality perception of Thai
users to G.711 and G.729, referring to packet
loss effects, which has been extended from