DTMF obfuscation

The system permits a manual obfuscation of a call using a DTMF key sequence at the user's handset. When a user enters a specified sequence of digits, the obfuscation begins, and any audio will be immediately and irreversibly overwritten with the tone specified in the  /audio/obfuscation/tones/ section of the settings.xmlfile. To stop obfuscation, the stop sequence must be entered, whereupon the audio will be written normally to the call's stream.

 The start and stop key sequences can be defined in the settings.xml file located in {app}\ProgramData\Tri-Line\Echo, using the and attributes:

The  attribute was provided to prevent a situation where extra digits have been erroneously entered, and therefore making it impossible to enter the correct sequence. After the specified DTMF timeout, all the digits previously entered will be cleared down. This also ensures that obfuscation does not occur during normal negotiation of DTMF telephone selection menus (inbound or outbound).