Voice Over IP Tutorial - 源码 - 源码 - 免费下载

Voice Over IP Tutorial

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资源说明：Telephone companies offload voice calls from public switched telephone networks (PSTNs) to voice-over-Internet Protocol (VoIP) networks because it is cheaper to carry voice traffic over Internet Protocol (IP) networks than over switched circuit networks. In the future, IP telephony networks are expected to enable innovative new multimedia services while working seamlessly with legacy telephone networks.

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