VoIP phone calls are usually delivered over a carefully-managed network often running Quality of Service (QoS) and the Session Initiation Protocol (SIP).

An Internet T1 connection can support up to hundreds of desktop computers depending upon the applications and bandwidth being utilized.

Many VoIP service providers guarantee that phone calls will not travel over the public Internet, but are converted and transmitted over the traditional telephone network directly from the VoIP provider's private Internet network that usually adheres to a defined Quality of Service (QoS).

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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 provides a great local access medum to connect LANs to the Internet and is quickly becoming the access method of choice were it is available.

Asymetric DSL (ADSL) allows more bandwidth to move data toward the end user (multimedia and text) than from the end user (mostly keystrokes and mouse behavior) to the Internet.

You can compare MPLS to Frame Relay and ATM technologies.

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MPLS can be used to facilitate layer 3 IP VPNs, layer 2 VPNs, Quality of Service (QoS), Class of Service (CoS) and to guarantee Service Level Agreements.