High Quality Content by WIKIPEDIA articles! Comcast Digital Voice (CDV) is a telephone product offered by Comcast Corporation. Comcast offers CDV in both residential and Business Class. It is similar to VoIP, but differs in that it operates on a dedicated server and assigns priority to the information sent over the CDV network, and also means that the information is not transmitted over the public Internet. On the HFC (cable) network, calls are placed into individual Unsolicited Grant Service (UGS) flows, based on DOCSIS 1.1 QoS standards. It utilizes E911, rather than the standard 911 service utilized by other large VoIP carriers. This allows the 911 service to immediately know where a caller is located, regardless of whether or not they are able to vocally relate their location to the operator. On July 16, 2008 Comcast officially reported that CDV had crossed the 5 million customer mark in less than a year.

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