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).

VoIP over Internet Protocol (IP), or VoIP, is a managed voice and Internet solution for businesses that falls into the industry niche referred to as IP Centrex (a feature-rich hosted analog voice solution), or Hosted Private Branch Exchange (PBX) that provides many features and capabilities that transform business communications beyond what traditional voice and data networks can offer.

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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As business networks face increasing numbers of applications with low latency and high bandwidth demands, MPLS allows network administrators to specify which applications should be prioritizes above others so that data flows across the network is an organized fashion that reflects the relative business importance of various type of data.

Connect your business local area network (LAN) to the Internet using the same protocol that operates on your LAN: Ethernet. This increasingly popular Internet access solution makes it easy to connect all of the computers on your LAN at your company to the Internet with minimal configuration and cost.

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).

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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.

Layer 2 MPLS VPNs (L2VPNs) are similar to Frame Relay, Asynchronous Transfer Mode, or point-to-point Wide Area Networks (WANs).