A VoIP phone or IP phone uses voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet, instead of the traditional public switched telephone network (PSTN).

Digital IP-based telephone service uses control protocols such as the Session Initiation Protocol (SIP), Skinny Client Control Protocol (SCCP), Unified Networks IP Stimulus (UNIStim) [Depreciated] or various other proprietary protocols.

The following topics are available for exploration:

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