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David A. Burgess dburgess at jcis.netI find that real-world networks page by IMSI 10%-25% of the time, depending on the operator and location. According to Harald's blog post on this topic, recently referenced on this list, he has made similar observations and offers some possibilities as to why. Also, as Steve Markgraf pointed out, GSM 04.08 9.1.22.3 explicitly disallows paging by IMEI. Networks are not supposed to do it and phones are not supposed to respond to it. It would be easy for someone to hack OpenBTS or OpenBSC to see how phones respond to this type of paging, but I have never seen it in a real network. I doubt seriously if any phone will respond, but I do wonder how many will crash their baseband stacks when presented with these messages. On Jan 30, 2011, at 9:34 AM, John Orlando wrote: > > It is up to the network to decide what ID type it wants to use to > page a mobile, and this is dependent on a number of factors. > Almost always it uses the TMSI, sometimes IMSI, and _very_ rarely > an IMEI. It is certainly possible that the network can also > request identity info (IMSI, IMEI) from the mobile on the dedicated > channel, as well as a whole host of other message requests while on > the dedicated channel. > David A. Burgess Kestrel Signal Processing, Inc. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/baseband-devel/attachments/20110130/baca3ca1/attachment.htm>