Understanding the Basic Networking Functions, Components,
and Signaling Protocols in VoIP Networks
Although voice over IP (VoIP) has existed for several years, it has only recently begun to take off as a viable alternative to traditional voice systems and public switched telephone networks (PSTN). Interest in VoIP has grown in part because the technology can help both service providers and enterprises to reduce costs by using a single IP network for both data and voice applications
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