These are two completely different technologies. Voice over DSL (VoDSL)is the packetizing of voice to transmit over broadband data lines. DSL uses existing copper local loop cabling to provide inexpensive broadband service to customers. Once you order this service, you are provided with enough bandwidth to access local packet networks that are optimized to carry both voice and data. Since broadband is a frequency divided technology, with the right equipment you can send multiple voice lines along with high speed data across a single copper pair.
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