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Zoom Adds VoIP Support To DSL Modem: Page 2 of 2

The X5v supports both VoIP and PSTN connections. To make this happen, the X5v includes the company's TelePort phone port that lets users plug in a traditional PSTN phone. Through firmware and separate subsystems, the modem can direct calls from these phones over either a VoIP or PSTN connection.

Safety and backup were big factors in Zoom's dual VoIP/PSTN approach. "By supporting PSTN, you have a tried and true emergency system," Manning said. "You also have a failover technique."

Zoom's X5v product has started shipping in the U.S. and overseas. The system is expected to be priced at $99 in retail stores.