CCNP Route (300 - 101) version 2.0: Introduction to Route Filtering

Route filters, along with route patterns/hunt pilots, use dialed-digit strings to determine how a call is handled. Route filters only apply when you configure a pattern that contains the at (@) wildcard. When the route pattern/hunt pilot contains the @ wildcard, Cisco Unified Communications Manager routes calls according to the numbering plan that is specified in the Numbering Plan drop-down list box. The route filter window that Cisco Unified Communications Manager displays varies according to the numbering plan that you select.