1. A method of detecting disallowed telecommunications between two persons, comprising: a) digitally recording at phone 1 a telephone call in which a person at phone 1 is a participant, to produce recording 1; b) digitally recording at phone 2 a telephone call in which a person at phone 2 is a participant to produce recording 2; c) digitally correlating recording 1 and recording 2 to detect an overlapping portion of recording 1 and recording 2 which are correlated to greater than a pre-determined threshold.