An SMDR record is generated at the end of each call between two devices on the system. Devices include extensions, trunk lines (or channels on a trunk), voicemail channels, conference channels and system tones.

• SMDR records are only produced for calls which are presented to another device or a barred short code. For example, an internal user dialing a short code that simply changes a setting does not produce a SMDR record.

• SMDR records are generated when each call or call leg ends. Therefore the output order of the SMDR records does not match the call start times.

• Each record contains a Call ID :

  • The Call ID starts from 1,000,000 and is reset back to that value following each system restart.

  • The Call ID is increased by 1 for each subsequent new call.

  • When a call moves from one device to another, separate SMDR records are output each part of the call. Each of these records has the same Call ID.

  • Each record indicates in its Continuation field whether there are further records for the same call.