1. A method of detecting unwanted conversational media sessions, said method comprising: providing a conversation proxy positioned between an originator of a real-time CMS and a client that is the intended recipient of the real-time CMS, in a manner to cause the originator of the real-time CMS to setup the real-time CMS intended for the client through the proxy; evaluating similarity between media data of the real-time CMS and a reference data item associated with a previous CMS; and controlling the real-time CMS based upon a result of said evaluating.