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VoIP Newcastle (voice over IP) is an IP telephony term for a set of facilities used to manage the delivery of voice information over the Internet.VoIP Newcastle involves sending voice information in digital form in discrete packets rather than by using the traditional circuit-committed protocols of the public switched telephone network (PSTN). A major advantage of VoIP Newcastle and Internet telephony is that it avoids the tolls charged by ordinary telephone service.

Reference: techtarget.com