2 Voice over IP Network

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VOIP, Version 1.6e _{ T.O.P. BusinessInteractive GmbH} Page 2 of 8

2.1 VoIP Network Elements ...3

2.2 Single-Site VoIP Location ...4

2.3 Multi-Site VoIP Location ...5

2.4 PBX Networking via IP ...6

2.5 PBX Migration towards VoIP ...7

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2.1 VoIP Network Elements

In order to create a Voice over IP infrastructure, three basic components are needed. The end user needs an IP phone, also known as terminal.

This can either be an IP phone or an IP client installed on user's PC. The centre element is an IP public branch exchange server (IP-PBX server) together with a gatekeeper. They are responsible for connection request management and switching.

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2.2 Single-Site VoIP Location

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2.3 Multi-Site VoIP Location

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2.4 PBX Networking via IP

The interconnection of legacy PBXs in different branch offices using a company intranet is a major domain of IP-based telephony. One of the most significant features is the independence from any time-based cost structures and the parallel use of resources for data traffic. Hence, IP-based PBX networking provides a lot of economic advantages.

A Voice over IP gateway is the heart of IP networking. It compresses a synchronous stream of speech data, encapsulates these speech data in IP packets and transmits them with a low data rate via the packet-oriented IP network.

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2.5 PBX Migration towards VoIP

Many companies own a quite powerful legacy PBX infrastructure with long-term service agreements and a defined period for capex depreciation. Therefor, it is uneconomic to put it out-of-service and replace it by new IP-PBX equipment. In many cases, IP-PBXs are used to complement an existing PBX, also known as "PBX migration towards VoIP".

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