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I want to build a passive (rx-only) scanner to listen to GSM and UMTS traffic. I am not interested in breaking encryption or anything like that - but more interested in collecting statistics and such.

Things like numbers of RACH bursts. Number of active calls on a cell/frequency/channel.

I found some things online - like OpenBTS and OpenBTS-UMTS. There are great, but the appear to be only intended to emulate and Basestation/ENodeB. I am looking for somthing a bit more generic - which can just analyse channels (e.g. in GSM scan all the common control channels and look for RACH bursts and assignment commands).

Is there anything like this out there? - Or can OpenBTS/OpenBTS-UMTS be made to do this?

I have an Ettus USRP to get started with.... not really sure I want to write a stack my-self!

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    $\begingroup$ Unfortunately, this question is off-topic because it is asking about working with a specific radio service which is not amateur radio (and unlike your other question it doesn't generalize). Sorry! $\endgroup$ – Kevin Reid AG6YO Nov 20 '17 at 18:44
  • $\begingroup$ awwww.....poo : ) .... you think I can re-word it? Does amateur radio not cover Telecomms? $\endgroup$ – code_fodder Nov 20 '17 at 20:02
  • $\begingroup$ In principle, someone could be using the GSM protocol on amateur radio bands under amateur radio licensing. In practice, it's not done. $\endgroup$ – Kevin Reid AG6YO Nov 20 '17 at 20:04
  • $\begingroup$ @KevinReidAG6YO - ah, great - lets go with that : ) (ok fair point, I'll look for another forum!) $\endgroup$ – code_fodder Nov 20 '17 at 21:31
  • $\begingroup$ @code_fodder After searching earlier, I don't think there's any relevant site here on SE. Google is your friend, hopefully. :-) $\endgroup$ – Mike Waters Nov 20 '17 at 23:24