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).

An Internet T1 (or T-1) T1 is a symmetrical local access connection to an Internet port that allows for downloads and uploads of up to 1.5 Mega Bits Per Second (Mbps) which is 30 times as fast as a 56 Kilo Bits Per Second (Kbps) dial-up connection over a standard Plain Old Telephone Service (POTS) phone line.

VoIP can provide big company telephone features on a small company budget. You are not merely trading one system for another: VoIP represents the next generation of telephony and messaging: Control calls anytime from anywhere, view incoming calls, view missed calls, view calls you have placed, view your voice messages like emails (find the voice message you want to listen to first – listen to it through your phone, remotely, or on any sound-enabled computer, forward it to another user or an email box), click to call people in your contact directory, enjoy four-digit dialing to all of your locations, etc.

The ADSL downstream receiving rate from the Internet usually varies from 1.5 to 9Mbps while the upstream sending rate usually varies from 16 to 640 Kbps.

The main limitation on DSL bandwidth speed is the distance from the customer premise to the local telephone company central office.

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 makes it easier to manage network for quality of service (QoS) because packets can be prioritized by business importance. For example, Voice over IP (VoIP) can be prioritized over email and web browsing packets.