Question

A user in the Chicago office reports that when they dial the 4-digit extension 4001 for a colleague in the same site, the call is routed to a different device with a conflicting overlapping pattern. Both the local site pattern (partition CHI-Internal) and a corporate pattern (partition CORP-Shared) match the dialed digits. The Chicago phone's line CSS lists partitions in this order: CORP-Shared, CHI-Internal. Which statement best explains the routing behavior and how UCM selects the matched pattern?

Accepted Answer

When two patterns are equally specific and both reachable via the CSS, UCM selects the pattern in the partition that appears first in the CSS list, so CORP-Shared is chosen.

Answer

UCM uses closest-match (longest/most-specific) digit analysis regardless of CSS order, so the most specific pattern always wins even if listed last in the CSS.

Answer

UCM randomly load-balances between equally matching patterns across all partitions in the CSS.

Answer

The line CSS is ignored for internal calls; only the device CSS determines which partition is searched, so partition order is irrelevant.