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 T3 (also spelled Internet T-3) is a broadband Internet connection that transfers signals at a rate of 45 Mbps. Both Internet T1 and T3 services are highly-reliable circuits that are usually guaranteed by a Service Level Agreement.

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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Multiprotocol Label Switching (MPLS) is a data communication standard that creates separate data paths for specific sequences of packets. Each packet is identified by a label that is encapsulated into each packet. This eliminates the need for Internet Protocol (IP) routers to look up the IP address of the next router in the network in order to forward the packet and as a result, speeds up the network.

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.

POTS local loop speed is increased by up to 50 times when a DSL modem is attached at the customer premise and a Digital Subscriber Line Access Multiplexer (DSLAM) is connected to the local access loop at the local telephone company central office (CO).

On Telecom Links, you can learn how an Internet T1 works and why it is more reliable than DSL or cable.

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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.