"How Dialed Numbers are Recorded in Call Detail Records"

Explanation.

The Call Detail Record (CDR) is a record of call information generated by Cisco Unified Communications Manager (CUCM). It contains detailed information about each call made or received by an IP phone or a gateway registered with CUCM. This information includes the calling and called numbers, call duration, call setup time, and other relevant call details.

Regarding the recording of dialed numbers in the CDR, the correct answer is option B: "CDR records the dialed numbers after route pattern level digit manipulation." This means that the dialed number is recorded after any digit manipulation that takes place at the route pattern level.

When a call is made, the dialed number is first analyzed by CUCM to determine how to route the call. This routing decision is based on the configuration of the route patterns and route lists in CUCM. Route patterns are used to match the dialed number, and route lists are used to define the order in which the route patterns are applied.

During the routing process, digit manipulation can occur at various levels, including the calling party transformation mask, the called party transformation mask, and the route pattern. The manipulation can include adding or removing digits, changing the number format, or translating the number to a different destination.

The dialed number is recorded in the CDR after any digit manipulation that occurs at the route pattern level. This is because the route pattern is the last point in the routing process where digit manipulation can occur before the call is sent to the destination.

Forced authorization codes and client matter codes are additional features that can be used to track call information, but they are not part of the dialed number itself. Forced authorization codes require the caller to enter a code before the call is connected, and client matter codes are codes used for billing or accounting purposes. These codes can be included in the CDR if configured, but they are not recorded by default for security reasons.

In summary, the dialed number is recorded in the CDR after any digit manipulation that occurs at the route pattern level, which is the last point in the routing process where digit manipulation can occur before the call is sent to the destination.