This book will help you understand the roles of IP voice gateways and gatekeepers and how to integrate them into your voice network.
Gateways can be configured with many different features and functions and can become quite complex. It is important for network engineers to understand gateway functions, be able to choose when to use which, and be able to configure their gateways. Engineers need a thorough understanding of gatekeeper function and configuration to ensure proper call flow. In addition, they must address issues of security and redundancy.
This chapter provides an overview of the basic building blocks of a Voice over IP (VoIP) network. It includes information on the following:
It also includes an overview of the network used in case studies throughout the book.
Part I: Voice Gateways and Gatekeepers
Gateways and Gatekeepers
Part II: Gateways
Media Gateway Control Protocol
Session Initiation Protocol
Connecting to the PSTN
Connecting to PBXs
Connecting to an IP WAN
Influencing Path Selection
Configuring Class of Restrictions
SRST and MGCP Gateway Fallback
Using Tcl Scripts and VoiceXML
Part III: Gatekeepers
Part IV: IP-to-IP Gateways
Cisco Multiservice IP-to-IP Gateway
Appendix A. Answers to Chapter-Ending Review Questions