Overview of Voice over IP (VoIP) and Network Protocols

-local telephone company practices,

-internal customer-specific codes.

In IP communications, dial plans track extension numbers assigned to terminals. No fixed connection path is needed.

●Routing is related to addressing and allows connections to be established between endpoints.

Although these functions are common to data and voice networks, the implementations differ.

Delay and Jitter

Data traffic is usually short and comes in bursts. Data networks like the Internet are designed to manage these bursts of traffic from many sources on a first-come, first-served basis. Data packets are sent to multiple destinations, often without any attempt to keep them in a particular order.

Voice networks are designed for continuous transmission during a call. The traffic is not bursty, and the conversation uses a specific amount of bandwidth between the two ends during the call.

Several features of data networks are unsuitable for voice telephony:

●Data network design delivers data at the destination, but not necessarily within a certain time, producing delay (latency). In data networks, delay tends to be variable. For voice messages, variable delay results in jitter, an audible choppiness in conversations.

●Variable routing also can result in loss of timing synchronization, so packets are not received at the destination in the proper order.

●Data networks have a strong emphasis on error correction, resulting in repeated transmissions.

Data network concepts include prioritization of traffic types to provide some form of greater traffic reliability, for example, for interactive transactions. However, data requirements tend to not be as strict as most voice requirements.

Starting with Release 1.1, the 4600 Series IP Telephones include a dynamic jitter buffer. This feature automatically smooths jitter to improve audio quality.

Tandem Coding

Tandem coding, also called transcoding, refers to converting a voice signal from analog to digital and back again. When calls are routed over multiple IP facilities, they can be subject to multiple transcodings. The multiple conversions between analog and digital coding result in a deterioration in the voice quality. Avoid tandem coding wherever possible in any compressed voice system, for example, by minimizing analog trunking on the PBX.

22 4600 Series IP Telephone Release 2.2 LAN Administrator Guide

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Avaya 4600 manual Delay and Jitter, Tandem Coding
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4600 specifications

The Avaya 4600 series is a line of IP telephones designed for enterprise communication. Known for its robust features and reliability, the 4600 series has been widely adopted in various business environments, from small companies to large corporations.

One of the standout features of the Avaya 4600 series is its support for Voice over Internet Protocol (VoIP). This enables businesses to make voice calls over the internet, which can significantly reduce telecommunications costs. The integration of VoIP technology also allows for seamless communication across different locations, making it ideal for businesses with multiple branches or remote employees.

The design of the Avaya 4600 series phones is user-friendly, featuring a clear display and an intuitive interface. Users can easily navigate through various options, making calls, accessing voicemail, and managing contacts a straightforward task. Many models in the series include customizable soft keys, which allow individuals to tailor the phone's functions to their specific needs. This flexibility is crucial in environments where employees need to quickly adjust their communications settings.

Another key characteristic is the high-quality audio. The Avaya 4600 series incorporates advanced audio technologies that ensure clear and crisp sound quality during calls. This is essential for effective communication, particularly in large meetings or conference calls where clarity is vital.

The Avaya 4600 series also supports various network protocols, including Session Initiation Protocol (SIP), providing compatibility with a wide range of network infrastructures and allowing organizations to choose the system that best fits their needs. This versatility makes the 4600 series an appealing choice for businesses looking to future-proof their communication systems.

Security is a major consideration in any enterprise communication solution, and Avaya has incorporated features in the 4600 series to protect against unauthorized access and cyber threats. Encryption protocols help safeguard call data, ensuring that sensitive business information remains secure.

In terms of deployment, the Avaya 4600 series can be easily integrated into existing networks, as well as managed remotely, which simplifies the installation and maintenance process. This feature is particularly beneficial for large enterprises that require scalability across multiple locations.

Overall, the Avaya 4600 series combines advanced technology, user-friendly design, and comprehensive security measures to provide a reliable and effective communication solution for businesses. As enterprises continue to adapt to a rapidly changing communication landscape, the Avaya 4600 series remains a strong contender for organizations seeking to enhance their telecommunications infrastructure.
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