VOIP-defined
Voice over IP (also called VoIP, IP Telephony, and Internet telephony) refers to technology that enables routing of voice conversations over the Internet or a computer network. To place calls via VOIP, a user will need a software based sip phone program OR a hardware based VOIP phone. Phone calls can be made to anywhere / anyone: Both to VOIP numbers as well as people with normal phone numbers.
Read about what types of VOIP phones / SIP phones exist and what VOIP gateways are and how they can be used.
IP PBX, SIP & VOIP common questions 
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