It is a call which is made over internet protocol (VoIP). For example, one can call using Google Voice to other recipient located miles away. Such call can also be international.
Real Tone Technologies Co., Ltd is a professional manufacturer of innovative VoIP equipments and unified network communication solutions. We offers a full line of VoIP products including All in one IP PBX phone system, VoIP gateways, E1/T1 PRI trunking
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