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Help contents > Advanced topics > Working with Call Detail Records

Working with Call Detail Records

The MCU is able to generate Call Detail Records (CDR) which may be used for auditing and billing purposes. When logging is enabled, records are generated whenever a conference starts or finishes, when participants join and leave conferences and so forth.

To use the CDR feature, there must be a 256 Mb compact flash card in the slot in the front of the unit. If there is no compact flash card present, and you have enabled CDR logging, errors will be recorded in the Event log.

When enabled, the CDR log is stored on the compact flash card and displayed on the Events > CDR log page. You can either view the CDR log on that page, or you can download it as an XML file. You cannot read from the compact flash card using any device other than the MCU.

When enabled, CDRs are flushed to the compact flash card every five minutes; when the card is full, the oldest logs are overwritten.

To view and control the CDR log, go to Events and click the CDR log tab. Refer to the tables below for details of the options available and for a description of the information displayed.

Call Detail Record log controls

The CDR log can contain a lot of information. The controls in this section will help you to select the information for display that you find most useful. When you have finished making changes, press Update display to make those changes take effect. Refer to the table below for a description of the options:


Field Field description Usage tips
Current status

This field indicates whether CDR logging is enabled or disabled. Use the two buttons (Enable logging and Disable logging) to change status. When you enable logging, the MCU writes the CDRs to the compact flash card.

Enabling or disabling CDR logging has immediate effect. There is no need to press Update display after pressing one of these buttons.

Ensure there is a compact flash card in the slot on the front of the unit.

Messages logged

The current number of CDRs in the log.


Filter string

Use this field to limit the scope of the displayed Call Detail Records. The filter string is not case-sensitive.

The filter string applies to the Message field in the log display. If a particular record has expanded details, the filter string will apply to these as well.

Expand details

By default, the CDR log shows only brief details of each event. Select from the options listed to display more details (when available).

Selecting All will show the greatest amount of detail for all messages, regardless of which other options are checked.

Call Detail Record log

This table shows the logged Call Detail Records, subject to any filtering applied (see Call Detail Record log controls, above). The fields displayed and the list's associated controls are described below:


Downloading and clearing the log

The CDR log includes all stored Call Detail Records, and all available details, regardless of the current filtering and display settings. It is possible to download all or part of the CDR log in XML format using the web interface.

To download the CDR log, click Download as XML or Download X to Y as XML. (Note that if there are a large number of logged Call Detail Records, it may take several seconds to download and display them all.)

To clear the CDR log, click Delete X to Y. This will permanently remove Call Detail Records X to Y. Due to the way the CDR log works it may not be possible to delete all records; the button name indicates which records can be deleted.

CDR log display

The CDR log list shows some or all of the stored records, depending on the filtering and display settings (see Call Detail Record log controls). You may click on the column headings to sort by that field. Refer to the table below to understand the fields displayed in the CDR log list:

Field Field description Usage tips
# (record number)

This is the unique index number for this Call Detail Record.



This field gives the time at which the Call Detail Record was created.

Records are created as different conference events occur. The time the record was created is the time that the event occurred.

Changing the time or NTP settings of the MCU will affect the displayed time for the Call Detail Records. For more information, refer to Further information about CDR time field, below.


This is the number of the conference to which this record applies

Each new conference is created with a unique numeric index. All records pertaining to a particular conference display the same conference number. This can make auditing conference events much simpler.


This shows the type of the Call Detail Record, and brief details if available.

The display settings allow you to display more extensive details for different record types.

The filter string allows you to select for display only records where a particular word or string occurs.

Further information about CDR time field

The CDR log time stamp is stored in UTC time and not local time like the Event log, but converted to local time when displayed in the CDR log.

Changing the time and NTP’s UTC Offset (on the Settings > Time page) will affect the CDR log time in the following ways:

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