Client Matter Codes are used solely for call accounting and billing purposes and are typically employed with Forced Authorization Codes.
When a user matches a route pattern with Client Matter Codes (CMC), a tone is heard and the system collects the CMC. Once collected, the Client Matter Code is recorded in CDR records along with the call.
Client Matter Codes are configured much in the same way as Forced Authorization Codes. As such, they have some of the same design considerations.
As with Forced Authorization Codes, if only a subset of users will be required to use Client Matter Codes, a new partition and route pattern will have to be created and configured appropriately.
With an E.164 dial plan, only one additional pattern may be required for each route pattern to which the Client Matter Codes will be applied. This pattern should match the E.164 compatible number and not the digits dialed by the user.
In a more traditional environment, a route pattern for each pattern per location may be required.
For more information on Client Matter Codes, see the CDR Analysis and Reporting Administration Guide (http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/service/8_0_2/car/CAR.html).