Overview

TIM Plus and TIM Enterprise offer the ability to obfuscate (mask out) one or more sections of the audio of a telephone call with an audible tone, preventing the listener from hearing the original speech.

This is normally required for compliance in certain industries where regulations dictate that certain spoken information be masked out, e.g. the Payment Card Industry - Data Security Standard (PCI-DSS).

Throughout this guide, we will adopt the PCI-DSS example above, where telephone calls that contain spoken credit card information need to be masked out by an audible tone, but only during those parts of the call when the card details are being spoken, leaving intact the rest of the call audio.

In this scenario, we'll assume that agents (employees that make or receive telephone calls) utilise an in-house or third-party data entry system into which credit card detailed are entered using a computer.

How it works

Considering TIM Plus or TIM Enterprise (in conjunction with one or more Magic boxes) records the call audio at strategic boundaries in your telecom infrastructure - usually your organisation's telephone lines, rather than each user's telephone handset - some reconciliation is normally required between those boundaries and the actual agent that handled the call.

By default, this reconciliation occurs automatically in TIM Plus or Enterprise, which is how the agent-centric calls that you see in call reports are able to be associated (matched) with each call, as seen from the point of view of a telephone line which delivers calls to many agents.

During obfuscation, it is necessary that a user or device sends at least two signals to TIM Plus or TIM Enterprise. Together, these two signals allow our software to mask out the audio between the two points in time that each signal was received.

At the point in time during an agent's call when obfuscation is necessary - e.g. "Can I have your CVV number please?" is spoken by the agent - a signal is sent by the agent to TIM Plus or Enterprise, which records the event along with the exact time it was sent. Similarly, when the sensitive part of the call is finished, a further signal is sent, which is also being recorded.

A single telephone call can contain more than one obfuscation and the number of signals required is always twice the amount of obfuscations in a call.

Assumptions

This guide assumes the following statements are true:

• You have a licensed copy of TIM Plus or TIM Enterprise that includes voice recording
• Your installation is at least version 3.0.0.55 

Common solutions

Taking the example of masking out some digits of a phone call when a credit card number is being quoted, most solution providers modify the data entry system that an agent uses.

Implementation

HTTP request

To send a start or stop signal, a simple HTTP GET request must be sent to the TIM Plus or TIM Enterprise web server.

Every request to the web server requires authentication, so ensure that the relevant HTTP authentication headers are sent with your request and that the username and password combination match an existing web user object in the Directory.

The response status code will indicate success or failure.

Request format

The request should be a GET request and take the following URL- encoded parameters, as per the following example:

Valid parameters are described in the table below:

Return values are specified as HTTP response status code. Although the body of some responses may contain informational text, you should not rely on this text to make any decisions as to whether the request was successful or not.

Valid status codes are as follows: