Cisco TUC 1.0 Instructor Series: Troubleshooting Gateway Issues

This course is included in our On-demand training solution.


This course is part of Skillsoft's Instructor Series, technical courses presented in spontaneous lecture-style by subject matter experts. This is 3 of 6 of the Troubleshooting Cisco Unified Communications Systems (TUC) 1.0 series. Troubleshooting Cisco Unified Communications Systems (TUC) v1.0 provides network professionals with the knowledge and skills required to troubleshoot Cisco Unified Communications systems in enterprise, midmarket, and commercial deployments. TUC teaches troubleshooting methodology, triage, resources, tools, and fixes at the integrated system or solution level; and for components, such as Cisco Unified CallManager, Cisco Unity, videoconferencing, and infrastructure.

Target Audience

This course is a necessity for any system or field engineers responsible for troubleshooting Cisco IP Telephony environments. This course is also recommended for any students attempting Cisco Voice and IP Telephony certifications.


Students enrolled in this course should be experienced with Cisco networking and possess an associate-level certification or the equivalent knowledge and experience. Successful completion of the following courses (or equivalent experience) is strongly recommended: – Implementing Cisco Quality of Service – Cisco Voice Over IP – Cisco IP Telephony

Expected Duration

116 min.

Course Objectives

Troubleshooting LDAP Replication Issues

Introducing Call Setup Issues and Causes

Troubleshooting On-Premises Single-Site Calling Issues

Troubleshooting Offsite Call Issues

  • – Describe some of the most common sources of issues when placing calls off site - Describe the troubleshooting procedure that you can use to troubleshoot MGCP, H.323, and SIP gateways - Explain how a Cisco IOS voice gateway performs digit analysis and dial-peer matching, including how the gateway performs inbound and outbound dial-peer matching - Explain how incorrect DDIs may cause calls to the PSTN to fail due to incorrect or incomplete digits - Explain the procedure to ensure that Cisco Unified CallManager and the gateway are correctly set up with respect to route patterns, route groups, route lists, and CoS - Troubleshoot the common voice issues involving caller ID, lack of ringback, dead air, one way audio, dropped calls, PSTN call failures, WAN call failures, and second dial tone functions, and provide possible solutions