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Single-site deployments are naturally easier to resolve because they have fewer pieces of the puzzle and less-complex dial plans. All devices are considered local to the Unified Communication Manager. This guide assumes you are familiar with the workings of how line and device CSS, partitions, and time-of-day (ToD) routing work. I do not detail how they operate except in relation to troubleshooting.
Some of the scenarios you might see in single-site deployment are fast busy, reorder tone, call forwarding problems, and one-way calling. Probable causes of such issues include the following: