Today 's VoIP service is much better in voice quality , provides clearer communication like talking over the PSTN , and enables users to make a phone calls through standard PSTN phones or feature-rich IP phones . Flexibility . Concerning the flexibility , VoIP system enables users to do things that are not provided by traditional phone technology that include receiving calls at handhelds devices such as personal digital assistants (PDAs . Increased productivity . Interestingly , for big organizations , the use of VoIP technology enables them to...











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