What is Voice over Internet Protocol (VoIP)? Is a family of transmission technologies for delivery of voice communications over IP networks such as the Internet or other packet-switched networks.

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VCtel website cung c¥p tÕng ài iÇn tho¡i hàng §u t¡i ViÇt Nam Công Ty TNHH iÇn Tho¡i Vân Chung Trå sß/ Head office: 157 ·ng Ti¿n ông , P. Trung LiÇt , Q. Ñng a , Hà NÙi Tel: (4) 3537 5995 ; Fax: (4) 3537...

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