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 (also spelled Internet T-1) is a high-speed digitally transmitted connection to the Internet that transfers signals at 1.544 Mbps (1,544,000 bits per second) that can be divided into twenty-four 64 Kbps telephone lines or trunks.

Voice over IP (VoIP) sends voice data in packets using the Internet Protocol (IP) instead of analog waves as does plain old telephone service (POTS) lines.

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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).

High Speed Internet Access via Ethernet local access connects end user Ethernet local area networks (LANs) to the Internet over a metropolitan wide area networks (WANs) at speeds ranging from 1 megabit per second (Mbps) up to 1 gigabit per second (Gbps). Internet access via Ethernet is an "always on", flat-rate service that offers faster, more cost effective Internet access than is available through traditional telecommunication access technologies such as T1 / T3 or E1 / E3 connections.

DSL service is delverd as Asymmetric DSL (ADSL) which is the most common application for Internet access, where fast downstream is required, but slow upstream is acceptable, and as Symmetric DSL (SDSL) which supports high speed access across the local access loop in both directions.

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.