Routing rule kinds
Rules narrow the candidate sites for a line. They run in priority order, lowest first, and the engine stops as soon as one candidate remains — see how routing works.
Rule set fields
Rule sets live under Routing rules in your organisation's settings and need organisation-admin access.
Routing exception resolutions
An exception records that a channel's chosen location and your rules disagreed. The hint was honoured; the exception is the note of where your rules would have differed. Background in when a channel disagrees.