Chapter 2. Voice over IP (VoIP)
The term Voice over IP (VoIP) does not refer to a single service but encompasses an entire collection of services that can fill the phone service needs of many different residential and business customers. VoIP can be used by a service provider to optimize its capability to carry many calls. VoIP can be used by small and large businesses for their office phone systems. VoIP can also be used as a good alternative (or supplement) to the public phone system for residential phone service, which is the focus of this book.
You might already be using VoIP and not even know or realize it. Many telephone service providers are starting to use some form of VoIP (transparently to you) inside their networks because of the cost ...
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