hnb_cs_lu.msc

[Neels Hofmeyr]

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 <nhofmeyr at sysmocom.de>          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 <nhofmeyr at sysmocom.de>          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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