Some analogue cameras have built-in microphones that you can connect to a sound input. Unfortunately, it is not possible to access audio streams from network cameras.

If you need separate microphones, it is recommended that you use line level microphones, which are available from most CCTV retailers.

Line level microphones contain a pre-amp which requires power, so check that a 12v power supply and a combined power and audio cable are included with the microphone. Some cables have two power connectors, in which case you can connect a microphone and an analogue camera with the same cable.