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Comcast is moving on plans to offer residential primary-line IP telephony service to customers in its home town of Philadelphia, Pa. by the second quarter of 2003. To fuel those plans, the MSO is installing Arris' DOCSIS 1.1-qualified C4 cable modem termination system.

Comcast added that it has completed a variety of technical lab trials of IP telephony service, and has concluded that the technology is mature enough to begin field testing and, eventually, commercial deployment.

The decision to move ahead with primary line, full-IP telephony in Philadelphia follows a number of trials Comcast has conducted leveraging Class 5 equipment and deploying IP in the access network. Most recently, Comcast completed such a trial earlier this year in the Detroit, Mich. area, where the MSO tested VoIP with the Arris C4 CMTS, Motorola Broadband cable modems and a GR-303 interface from the now-defunct TollBridge Technologies.

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