The ability to troubleshoot an IP telephony environment and the underlying network infrastructure is vitally important, just as it is in any complex system. This chapter of "Troubleshooting Cisco IP Telephony," by Paul Giralt, Addis Hallmark and Anne Smith, introduces the good troubleshooting methodology necessary to identify and resolve problems in an IP telephony solution. Learn how to break down problems to find the root cause. Descriptions of each part of the Cisco IP telephony solution help you understand the functionality of each part of the solution and how each part interacts with other parts of the solution. You'll then learn what steps to take and tools to use to identify and resolve the cause of the problem.