Client Matter Codes (CMC) assist with call accounting and billing for billable clients. CMC force the user to enter a code to specify that the call relates to a specific client matter. You can assign client matter codes to customers, students, or other populations for call accounting and billing purposes.
The CMC feature requires that you make changes to route patterns and update your dial plan documents to reflect that you enabled or disabled CMC for each route pattern. You can access the Client Matter Codes search and configuration windows from Call Routing > Client Matter Codes in Cisco Unified Communications Manager Administration.