Abstract: An inmate messaging system and method for notifying an inmate in a prison facility of messages received from a caller outside the prison facility. The caller dials into the inmate messaging system using, for example, a conventional “touch tone” telephone. The caller is prompted by the system for identifying information, which is verified against known information in a database. Identifying information can include a PIN for verifying the caller's account. During a set-up session, the system prompts the caller to record her name. The name recording is used to verify the account when the caller leaves a message for the inmate, and is also used to identify the account when the inmate retrieves the message from within the prison. The caller can specify a time with the message for returning the telephone call, or have the call placed immediately. The inmate accesses the inmate messaging system via a prison telephone.

Abstract: A system and method for analyzing audio signals sampled from a telephone line during moving sample windows in order to detect indicia of three way calling attempts. The system and method sample audio signals on the telephone line, sort the sampled signals into a profile of levels for the sampled audio signals, and monitor the profile of sampled audio signals for reset and reference conditions. Reset conditions are pulse patterns identified from sampled audio signals that are inconsistent with patterns generated by three way call events. Reference conditions are pulse patterns identified from sampled audio signals that are consistent with patterns generated by three way call events. A sampling window and its associated profile are reset when reset conditions are detected. The profile is tagged as a potential three way call event when reference conditions are detected in a sample profile and no reset conditions are detected over the selected sampling interval (sampling window).

Abstract: A system and method for analyzing audio signals sampled from a telephone line during moving sample windows in order to detect indicia of three way calling attempts. The system and method sample audio signals on the telephone line, sort the sampled signals into a profile of levels for the sampled audio signals, and monitor the profile of sampled audio signals for reset and reference conditions. Reset conditions are pulse patterns identified from sampled audio signals that are inconsistent with patterns generated by three way call events. Reference conditions are pulse patterns identified from sampled audio signals that are consistent with patterns generated by three way call events. A sampling window and its associated profile are reset when reset conditions are detected. The profile is tagged as a potential three way call event when reference conditions are detected in a sample profile and no reset conditions are detected over the selected sampling interval (sampling window).