1. A voice over Internet Protocol (VoIP) targeted advertisement delivery method to subscribers, operable in a processor coupled to a memory, comprising steps of: monitoring all outgoing communications on a server in order to identify a VoIP telephony signal; detecting during said monitoring a VoIP telephony signal indicating that a VoIP call setup for a VoIP call is in progress; determining the telephone number of the caller; determining from an internal database whether a number for the VoIP call dialed is not a government service number or an emergency call number; querying the internal database and designating that the caller is a subscriber and candidate for a targeted advertisement delivery; querying the internal database and determining which targeted advertisements are directed to said caller based on at least one of a number of target advertising criteria, retrieving and transmitting the targeted advertisement to the caller along with a ring back, tone during the call setup prior to a called party answering the VoIP call; delivering the targeted advertisement during the ring back operation, while a VoIP feedback simulates ringing at the called party without impeding progress of any communication service operating the associated caller's VoIP telephone or the VoIP call; and competing volume for each of simulated ringing and targeted advertisement is adjusted when a system incorporating said delivery of the targeted advertisement during ring back operation is configured for the particular caller; and stopping said advertisement and monitoring of the VoIP call once a second party has answered the telephone call.