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.
Digital IP-based telephone service uses control protocols such as the Session Initiation Protocol (SIP), Skinny Client Control Protocol (SCCP) or various other proprietary protocols.
From a user standpoint, IP phones work the same way as analog phones. The difference lies in the transmission. The advantage of IP phones is that these digital signals can be transmitted anywhere across the internet by using nothing but your regular internet connection, thereby bypassing the trunks and cables, and therefore the charges, laid down by telephone companies.
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