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. Voice over IP (VoIP) is a technology devised to utilize your existing IP infrastructure to carry voice. This can be accomplished by using intelligent phones that have both a MAC address (NIC card) and an IP address. Your voice is encapsulated into an IP packet and transmitted to the PBX. This allows your phone to be identified by an IP address instead of a phone number. The reason behind this is so that like a computer, a phone can be relocated easily to any location without the need for patching or PBX reprogramming. Essentially, since the PBX now communicates to the phone using IP, it will know what phone number to send and receive voice information regardless of location.
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