7.3.5. Call Suppression¶
The Call Suppression form provides the means to suppress, or prevent, calls from recording (audio data will not be recorded, but the recorder retains non-audio data about the calls). This feature can be used for a variety of purposes, including implementing a legally mandated attorney-client privilege, or assuring privacy for undercover officers or high-ranking officials.
Two mutually-exclusive suppression methods are provided:
Suppress on match (Blacklist): Suppresses recording for all calls that match a telephone number in the list. The recorder discontinues recording a call as soon as the telephone number is recognized.
Record on match (Whitelist): Suppresses recording for all calls except for those that match a telephone number in the list.
The suppression method applies to the entire list of telephone numbers rather than to individual telephone number entries. To select a suppression method, click on the radio button next to it.
The Suppress DTMF feature applies to all call suppression. When recording is suppressed for a call and this feature is enabled, the recorder will not store a record of the telephone keypad dialing tones (Touch-Tones*) that occur during the call. This can be useful to prevent the storage of sensitive data transmitted by DTMF during a call, such as social security numbers, passwords, and personal identification numbers.
Click the *Suppress DTMF* checkbox to enable this feature.
To suppress recording, you must select a suppression method and create a list of telephone numbers. Then you must enable record suppression on a channel-by-channel basis via the boards setup page. The following instructions describe how to create and manage a list of telephone numbers.
To add a new entry to the list of numbers, click *Add Pattern* button. This allows you to enter in Suppression Digits, and a Description.
Enter a full or partial telephone number. A call containing this numeric sequence within its telephone number will cause a match. For example, if you enter 800-555-1234, any calls from this number will cause a match, but if you enter only 555, any calls with this sequence within the number will cause a match.
A partial number allows you to specify all calls from an area code or exchange. Whereas the Blacklist method is typically used for very specific telephone numbers, the Whitelist method is often used with a partial number sequence. For example, if you want to match on an area code and exchange, you can enter 800-555. (Note that a call from 900-880-0555 will also match this number.)
Enter a description and click *Add*. The new pattern should appear in the suppression list.
When all patterns have been entered, click “Submit Global Settings” at the top of the page.
To enable suppression on a channel, add the “suppression” column on the Recording Interfaces page, then change Suppression from None to “Global List”
Note that Blacklist or Whitelists affect all channels where suppression is enabled. Suppression is not configurable per channel.