KayPam
Is your ANR specific to your aircraft type? It is around 15 years since generic broadband ANR systems were rendered obsolescent by programmable ones.
Remember, an ANR headset or helmet is no longer just an Aircrew Equipment Assembly, it now also forms an integral part of the Intercom/Comms System and must be designed to match it. In practice most will "work" in the sense you will notice a reduction in background noise, but it will be a compromise. This may manifest itself in odd noises. Also, ANR is designed to reduce damaging noise, not necessarily annoying noise.