HiI have installed a HIKVISION NVR DS-7608NI-K2/8P and five DS-2CD2385FWD-I cameras, I would like to use the Audio input for a microphone and the Audio output for a speaker can you please tell me what kit you recommend for this, I want to be able to talk through the HIKVISION APP to anyone who enters the property and be able to hear them, I do not want to record the conversations, also I would like to operate a siren from the app is that possible.RegardsChris