Internet Phone / IP Phone / SIP Phone / VoIP Phone

Various names are used for any hardware device or piece of software that allows packets of voice data to pass over the internet between users, and enables voice calls and communications. H.323 or Session Initiation Protocol (SIP) can guide the data packets; gateways convert audio data and codecs convert video data. IP phones that bypass any Public Switched Telephone Network (PSTN) do not require gateways. Voice over Internet Protocol (VoIP) telephony offers low to zero-cost call rates.

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