One of the advantages of VoIP is that voice and Internet services are delivered over the same local loop access circuit using the Internet Protocol (IP).

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VoIP over Internet Protocol (IP), or VoIP, is a managed voice and Internet solution for businesses that falls into the industry niche referred to as IP Centrex (a feature-rich hosted analog voice solution), or Hosted Private Branch Exchange (PBX) that provides many features and capabilities that transform business communications beyond what traditional voice and data networks can offer.

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MPLS is a standardized data switching technology that optimizes network traffic flow and eases management of data networks. MPLS carves specific paths data packets that are identified by a label that saves the time needed for a router to look up the address to the next node in order to forward the packet. MPLS works with the Internet Protocol (IP), Asynchronous Transport Mode (ATM), and frame relay network protocols. MPLS allows most packets to be forwarded at the layer 2 (switching) level rather than at the layer 3 (routing) level and makes it easy to manage quality of service (QoS).

Ethernet is the most widely-used data network protocol today. Standardized as IEEE 802.3, the Ethernet protocol is used for local area networks (LANs) at the Layer 1 (Physical Layer) and Layer 2 (Data Link Layer) of the OSI networking model.

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You can compare MPLS to Frame Relay and ATM technologies.

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Layer 2 MPLS VPNs (L2VPNs) are similar to Frame Relay, Asynchronous Transfer Mode, or point-to-point Wide Area Networks (WANs).