FiOS Digital Voice: Here's How It Works | News Release | Verizon
https://www.verizon.com/about/news/press-releases/fios-digital-voice-heres-how-it-works
WebJun 3, 2010 · What it is instead is a versatile, reliable voice service from Verizon that completes the FiOS service picture and offers customers many new, innovative features. FiOS Digital Voice uses an IP (Internet protocol)-based network of its own for calling and feature delivery, engaging the regular phone network only when a FiOS Digital Voice …
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