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Cisco Router Configuration Handbook, Second Edition by Andrew Whitaker, Steve McQuerry - CCIE No. 6108, Dave Hucaby - CCIE No. 4594

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Chapter 11. Voice and Telephony

This chapter presents several building blocks that can be used to implement a fully functional Voice over IP network. Transporting real-time, bandwidth-insensitive (or time-critical) voice traffic over a data network requires the use of many IOS features, possibly configured on many routers. You should carefully consider how to build such a network, adding a layer of complexity at a time. For example, you should approach a voice network in this fashion:

  1. Build a \working IP network.
  2. Add the Quality of Service (QoS) features necessary for transporting voice at the appropriate places in your network. (Although it might be tempting to get voice traffic functioning first, getting QoS configured correctly at the start ...

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