CDRs are usually only sent when calls are made through a trunk. In the case of an Intra-switch call (for example, a call that goes to another phone directly connected to the PBX), a CDR will not be sent unless Intra-switch CDR has been enabled. Intra-switch CDRs are only available if enabled for specific extensions.
Prerequisites
If the Intra-switch CDR field is set to y on Page 1 of the CDR SYSTEM PARAMETERS form, then the INTRA-SWITCH CDR form also needs to be updated to define the extensions that will be subjected to call detail recording.