Three Way Calling and Call Detection

Inmate Telephone Service
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Three-way Calling and Three-way Call Detection in Inmate Telephone Systems

How do three-way calling systems work?

Three-way calling systems, also known as conference call systems, allow callers to invite a third party to a telephone conversation already in progress. Most homes already have three-way calling options available to them, either through special equipment or through facilities provided by the telephone exchange.

Why are three-way calls forbidden in inmate telephone systems?

A three-way calling system can allow any third party to be contacted anywhere, including numbers that may otherwise be blocked for inmates. This means that inmates can use a three-way calling system to bypass regulations and make threatening or illegal phone calls or participate in criminal activity. To prevent this from happening, three-way calls are strictly prohibited in inmate telephone systems.

Approximately 10% of inmates attempt to make three-way calls at some stage during their incarceration, and most of these calls are related in some way to criminal activity. The recording of inmate calls has contributed to the prosecution of inmates for these crimes, but they still occur. In the past, three-way calls have been used to harass witnesses or crime victims from previous incidents.

At home, a three-way call can be made by briefly depressing the cradle switch. This brief signal break indicates to the telephone switch that the subscriber wishes to make a three-way call. A dial tone then signals the caller to dial another number. Once the caller is connected to the third party, he must briefly depress the cradle switch one last time and the third party will be connected to the original call, commencing the three-way conference call.

Blocking Three-way Calls

All inmate telephone systems require features for three-way call detection and disconnection. Despite this, the systems have only been successful in detecting three-way calls approximately 30-40% of the time, compared to suppliers claims of an 80-90% success rate. Plus, experienced inmates have always found ways to avoid three-way call detection by tapping on the receiver, singing or making loud noises.

You can learn how to make three way calls and save money on making phone calls from jail in our inmate phone calls guide.

Learn more about avoiding three way call detection.

Don't miss our guide on how to save money on Inmate Phone Calls.

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Three Way Calling and Call Detection

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