Voice over Internet Protocol private network call rerouting or switching, substantially transparent to both the caller and the called party. The source delivers light into the entry aperture of the primary reflector, and the primary reflector delivers the light at the exit aperture of the primary reflector. The bias current generator generates an output current related to temperature according to the operating voltage of chip. The method includes receiving first and second audio signals, receiving information transmitted in a vertical blanking interval of the transmitted analog program, interpreting the information and removing a replaceable audio signal, and replacing the replaceable audio signal with a user-selected audio signal. The lens has a reticle to allow the shooter to align the image on the lens and sight the device onto the target.