Update: it seems that for IuPS/SGSN, a quite identical Identity Request message is indeed answered upon by the UE, so the reason why I'm not receiving one for IuCS/CSCN is unclear.
~Neels On Wed, Feb 17, 2016 at 02:18:54PM +0100, Neels Hofmeyr wrote: > Hi Harald, > > in osmo-iuh/doc/hnb_cs_lu.msc I find that after the location update > request from the UE, an identity request "should" follow from the CN. > > Yesterday I made my first pcap using our hNodeB and that weighty black UE > we use for testing, and saw that the MSC indeed sends out an identity > request at that time [1], however, the UE simply never responds to it. > > My question: is the hnb_cs_lu.msc declarative and definitely correct, or > could it be that in 3G, UEs in general expect authentication first, as > the "osmo-iuh/pcap/UPP RANAP.pcap" suggests (starting at packet #335). > > Since my sources tell me (i.e. Daniel) that an identity request at that > time is indeed kinda special practise by openbsc to collect all IMEIs we > possibly can, I'm going for authentication first. > > Just wanted to make sure you agree that the hnb_cs_lu.msc may be erratic > in that case. Thanks! > > ~Neels > > [1] near openbsc/src/libmsc/gsm_04_08.c:589 (thanks Daniel!) > > -- > - Neels Hofmeyr <[email protected]> http://www.sysmocom.de/ > ======================================================================= > * sysmocom - systems for mobile communications GmbH > * Alt-Moabit 93 > * 10559 Berlin, Germany > * Sitz / Registered office: Berlin, HRB 134158 B > * Geschäftsführer / Managing Directors: Holger Freyther, Harald Welte -- - Neels Hofmeyr <[email protected]> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschäftsführer / Managing Directors: Holger Freyther, Harald Welte
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