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 (or T-1 line) is a digital, dedicated local access connection supporting data rates of 1.544 Megabits Per Second (Mbps) that can be channelized into 24 individual channels that each provide 64 Kilobits Per Second (Kbps).

Hosted Voice over Internet Protocol (VoIP) is a voice and data technology that supports several telecommunications protocols, such as Session Initiation Protocol (SIP) and Internet Protocol (IP), that that makes it easy for people to use the Internet to make telephone calls while saving money on premise hardware.

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.

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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.

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.

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).

Wireless Internet is a new way to access the Internet at high speeds from anywhere in the United States. Wireless Internet is delivered via terrestrial transmitters and receivers or by satellites that orbit the Earth while transmitting and receiving high frequency radio internet data to a small dish located at the customer premise. Two-way satellite radio system is reliable, easy to set up and is mobile. You can move the subscriber terrestrical or satellite dish and re-connect with ease.

If you are looking for clear, concise definitions of telecommunication terms and explanations of telecom services, especially how they are used and how they work, TelecomLInks is a great place to start.

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.