/mcpMany issues arise in situations where multiple fax machines are not able to pass fax traffic. It is easiest to isolate two fax machines that have problems and concentrate on a simple topology. Determine how these machines are connected to one another and resolve the issue between this pair first. In addition, it is advised to draw a complete picture of the topology and determine how the fax machines are interconnected. To troubleshoot one issue at a time minimizes confusion and allows for methodical troubleshooting. It is also possible that the solution for this problem resolves other fax relay problems in the network. Most fax relay problems result from poor VoX configuration or network design. These lead to basic connectivity problems and physical line or packet loss and jitter problems. After you have identified and isolated the problem, the next steps are to verify the basic VoX configuration and monitor the health of the network. 2. Check Basic Connectivity Basic fax connectivity issues can be the result of these factors: Normal voice connectivity problems. Confirm that normal voice calls can be completed before you investigate fax connectivity. If there is no telephone attached, unplug the fax machine and connect a regular telephone. If normal voice calls do not connect, the issue is possibly VoX-related, and you can troubleshoot the problem as a normal voice connectivity issue before you proceed with fax troubleshooting. 1. Configuration problems related to dial peers such as these: Wrong dial peer matched. After you ensure that voice calls can be successfully completed in both directions through the VoX network, issue the show call active voice brief command and note the dial peers that are matched with each voice call. • 2.