An engineer is asked to implement on-net/off-net call classification in Cisco UCM. Which two components are required to implement this configuration?…

On-net/off-net call classification is applied where CUCM decides whether a call stays inside the enterprise or leaves to the PSTN.

1. Route Pattern – the pattern that matches a dialled number contains the “Call Classification” field; tagging the pattern OnNet or OffNet classifies every call that matches it.

2. SIP Trunk – the trunk/gateway that carries calls to or from the PSTN also contains the identical “Call Classification” field; marking the trunk OffNet ensures that any call routed over it is treated as PSTN.

Together a route pattern that selects a PSTN-bound SIP trunk provides full on-net/off-net classification.

A. CTI route point – lacks a Call Classification field; used only for call control applications.

B. SIP route patterns – object is for URI routing in Expressway; CUCM does not expose Call Classification on it.

C. Route group – merely an ordered list of trunks/gateways; it has no Call Classification attribute itself.

1. Cisco Unified Communications Manager Administration Guide 12.5(1)SU3, “Route Pattern Configuration—Call Classification field,” Section “Configure Route Patterns” (Doc ID: CUCMBKA92F368400system-configuration-guide-125, p. 29).

2. Cisco Unified Communications Manager Administration Guide 12.5(1)SU3, “SIP Trunk Configuration—Call Classification field,” Section “Configure SIP Trunks” (same doc, p. 54).

3. Cisco Unified Communications SRND 12.x, Chapter “Dial Plan—Call Classification,” para. 2, stating “Route patterns and trunks/gateways are the two primary elements used to mark calls OnNet or OffNet.”

(Only official Cisco documentation cited; no commercial prep sources used.)