1. At the outset, I assume that you are primarily asking these questions in relation to a defence in a criminal trial. If the telephone conversations are your own telephone recordings, then you may admit them in evidence, provided you are able to satisfactorily show that you properly prepared the recording device which made the recordings. These recordings may be admissible in your own defence in a criminal trial. However, if these recordings are third party telephone conversations, then you will have to show how they came into your possession and the basis on which they were made. If it is the prosecution who are admitting telephone conversations, then they merely need to show that the police had the necessary authorisation to record or to obtain the telephone calls and that they were recovered from the telephone company.