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Voice over Internet Protocol or IP (Packet Switched) uses a data network to send small “voice packets” based on the destination address in each packet.
IP service can be offered by (or through) providers in two ways:
VoIP that uses the Provider’s own (Broadband) network (e.g., Comcast Digital Voice)
If a provider uses IP on its own network to send the voice packets, the quality of the call is uni-formly maintained because it allows the provider to prioritize voice packets so that they arrive on time. Otherwise, data on the network could delay the voice packets and result in poor call quality.
If IP uses the public Internet, the quality of the call may not always be uniformly maintained because the provider has less control of the voice packets competing with data packets.