Remote Seven Microphones with common gain control can be attached to the System's Security Card enables user to Audio Monitoring Feature for Security purpose. The Microphones can be accessed by executive extension user within the premises as well as from any where in the world by making a phone call on DISA enabled Trunk to the premises. The Microphones have independent interfacing to the system and extension or trunk is lost. The Microphones share same speech path as Door Phone and Recording. The Microphones can be placed within the dummy switch of electric switch board or can be hidden in the telephone instrument itself.