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Voice Technology Basics

Welcome to the Voice Technology Basics lesson. Combined voiceand data networks are definitely a hot topic these days. In this module, we’llstart by discussing the convergence of voice and data. We’ll present a bitof history as well so that you understand how this all came about.

We’ll then move into discussing actual voice technology. There’s alot to cover here and a lot of vocabulary you’ll need to be familiar with.We’ll start with understanding the traditional telephony equipment. We’llalso discuss voice quality issues as well as enabling technologies such as compressionthat are making voice/data networks possible.

After we cover the technology, we’ll discuss Voice over IP, Voice over FrameRelay, and Voice over ATM. We’ll then cover some of the new applicationsthat are possible on combined voice/data networks.
Finally, we’ll look at how a company might migrate from traditional telephonyto an integrated voice/data network.

Contents

-Convergenceof Voice and Data

-Examplesof Voice Technology Basics

-VoiceTechnology Basics

-TraditionalTelephony

-SignalingVoice Technology

-Signalingin a Computer Telephony System and Voice Routing

-Voiceover Data Networks

-VoiceTechnologies Compression

-QoSin Voice Technology

-Voiceover Data Transports

-Voiceover IP Components

-VoIP- H.323 Interoperability

-Voiceover Frame Relay

-Voiceover Asynchronous Transfer Mode (ATM)

-&nbspApplicationsof Integrated Voice and Data Networks

-Voice- Capable Route

-PBX Networking to New Voice Networking

Convergence of Voice and Data

Today, voice and data typically exist in two different networks.Data networks use packet-switching technology, which sends packets across a network.All packets share the available network bandwidth. At the same time, voice networksuse circuit switching, which seizes a trunk or line for dedicated use. But thisis all changing...

Data/Voice Convergence—Why?

There is a lot of talk today about merging voice and data networks.You may hear this referred to as multiservice networking or data/voice/video integrationor just voice/data integration. They all refer to the same thing. Merging multipleinfrastructures into one that carries all data, regardless of type.

In this new world order, voice is just plain data. The trends driving this integrationare cost initially--saving money. Significant amounts of money can be saved bydoing away with parallel infrastructures. In the long run, though, new businessapplications are what will drive the integration of data and voice. Applicationssuch as:

- Integrated messaging
- Voice-enabled desktop applications
- Internet telephony
- Desktop video (Intel ProShare, Microsoft NetMeeting, etc.)

So, how does a combined network save money?

Data, Voice, and Video Integration Benefits

The place where you can realize the greatest savings is inthe wide-area network (WAN), where the bandwidth and services are very expensive.

The concept here is that at some point, you want voice data “to ride forfree.” If you look at the overall bandwidth requirements of voice comparedto the rest of the network, it is miniscule. If you had to charge per-packet orper-kilobit, voice is basically “free.”

Companies should experience several kinds of cost savings. Traditionally, theoverall telecom budget includes three basic sections: capital equipment, supportoverhead such as wages and salaries, and facilities. The majority of costs areincurred in the facilities. Facilities charges are recurring, such as leased-linecharges which occur every month, as opposed to capital equipment, which can beamortized over a couple of years.

Because facilities are the largest expense, this can also be the place where themost money can be saved. The largest part of the facilities charge is the telecombudget. If the telecom budget can be reduced, money can be leveraged out of thatto pay for network expansion.

People tell Cisco, “We have to leverage our budget to converge data, voice,and video. We have exponential applications that demand growth and we don’tknow how to finance that.” Cisco advises customers to look at their establishedbudgets and see if there is any way to squeeze money out of them by putting ina more efficient infrastructure with features such as compression, and move alltraffic over a single transport mechanism. On average, users can expect a 30 to50 percent reduction in their IT budgets with convergence.

New applications that include voice are becoming increasingly important as theydrive competitive advantage.

Before we get into the nuts and bolts of voice technology, let’s take alook at just a couple of these applications that multiservice networks enable.

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