Many disgruntled employees ask if it is illegal to record their boss or a co-worker, etc. during a telephone call. It is unlawful to do so unless they know you are recording the conversation and have given their consent. An Illegally taped phone conversation cannot be used in court as evidence and may subject the person(s) who recorded the conversation to criminal charges. It is not illegal to record someone who is speaking in a setting where they know that others can hear them such as in a public place where they have not expectation of privacy.