Voice over data: Many conversations, one network - from Switching to VoIP

This chapter from Switching to VoIP by Theodore Wallingford looks into the challenges faced by VoIP applications, especially the challenges of negotiating multiple standards. It explains how VoIP fits in on the different layers of the OSI model, and provides instructions for configuring an IP hardphone and the VoIP test network, and making an IP-to-IP phone call.

Switching to VoIP
 

Based on real-world experience, this handy solutions manual addresses the most common VoIP migration challenges. Find out how to build your own VoIP system, install it, and begin making calls -- so you can start saving today. Ideal for IT managers, network engineers and system administrators.

In this chapter: When voice sounds are transmitted using datagrams on the IP network, telephony gains all the same characteristics as the data network itself. Just like applications for file sharing and printing via the network, software can be made to perform useful tasks using the datagrams of voice streams and signals -- tasks like conference calling and voice mail. These tasks are the applications of Voice delivered using IP datagrams is the essence of VoIP. This chapter looks into the challenges faced by VoIP applications, especially the challenges of negotiating multiple standards. It explains how VoIP fits in on the different layers of the OSI model, and provides instructions for configuring an IP hardphone and the VoIP test network, and making an IP-to-IP phone call.

Read the rest of the excerpt in this PDF.

Excerpted from Switching to VoIP by Theodore Wallingford (ISBN: 0-596-00868-6).

Copyright © 2005, O'Reilly. All rights reserved.

This was last published in September 2006

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