Description

When a call is setup in a Cisco Unified Communications system, configuration errors can cause problems in many areas. Some of these areas include router configurations, Cisco Unified Communications Manager configurations, Quality of Service (QoS) settings, ISDN settings, and carrier issues. This course provides an overview of some of the issues that can arise with call setup in a Cisco Unified Communications system.
If you experience a problem when making a call between two devices within the same cluster, at the same site, the two most likely causes of the problem are Class of Service (CoS) settings or translation patterns. CoS in Cisco Unified Communications Manager takes the form of partitions and Calling Search Spaces (CSSs). Issues with CoS can manifest in several ways: one-way calling, forwarding issues, and call setup problems. To understand and troubleshoot these problems, you need to know how Cisco Unified Communications Manager collects and analyzes digits.
The issues that are commonly encountered can be with the Intercluster Trunks (ICTs), overlapping dial plans, and issues with calls between clusters. These issues collectively are all a part of the overall Cisco Unified Communications Manager dial plan.
This course discusses three out of four possible troubleshooting areas in which you may have call setup issues. The course looks at troubleshooting on-premises single-site calls, on-net multisite calls including intercluster calls. The course also discusses the different topology attributes for completing a call and the different tools and commands both on gateways and on the Cisco Unified Communications Manager.