If you plug a system into an XPR, and you know 1000% that the information entered is correct, and you STILL aren't decoding audio or seeing ID's, then its most likely a RAS protected system. Unless you see the key icon flashing on the radio then it's encrypted, or better yet maybe it's encrypted and has a RAS key. RAS is not encryption but the transmissions also can't be heard by radios unless you have the key. As mentioned above, DSD and most DMR scanners do pretty good however I do know that some scanners have a delay in audio because of the key. It should also be mentioned that RAS is Motorola proprietary. So in the off chance that you have legitimate access to a system and use your own radio, you MUST use a Motorola on the system, you can't use something like a TYT or Anytone(not to mention these radios don't do trunking).