Start Here

Detailed Information

In this module, you will learn about trunks, analog E&M signaling, and E&M configuration and troubleshooting. E&M signaling types, start dial supervision signaling protocols, and common VoIP configuration elements are discussed. Hands-on Configuration Labs reinforce the concepts covered in the written tutorial and give you a chance to try out what you have learned about VoIP troubleshooting in the Challenge Labs.

Objectives:

After completing this module, you should be able to:

• Differentiate between Foreign eXchange Office (FXO), Foreign eXchange Service (FXS), and E&M signaling
• Understand the basic differences between central office (CO) trunks and private branch exchange (PBX) trunks
• Understand the concept of trunk signaling and how it relates to supervisory signaling
• Identify and understand the uses of the five different types of E&M signaling and E&M interfaces
• Define the three start dial supervision protocols, and understand how they are implemented on Cisco 3640 routers
• Configure a basic analog VoIP connection using E&M interfaces and PBX trunking
• Understand the use of the number expansion feature in an analog E&M configuration
• Understand the concepts of input gain and output attenuation
• Identify the use of a gain/loss plan in a network
• Understand and configure the interdigit timeout period on a router
• Identify some VoIP connection problems commonly found when using E&M signaling
• Troubleshoot an analog VoIP connection using E&M

Labs

• Configure analog VoIP connections on two Cisco 3640 routers using E&M interfaces and PBX trunking.
• Configure an analog E&M VoIP connection using the following features:
  • Number expansion
  • Input gain
  • Output attenuation
• Challenge Labs (3)