MDL-Error in case of OsmocomBB+OpenBTS

[Pavel Baturko]

Hi list,

I'm trying to connect my OsmocomBB phone to OpenBTS and I always
got MDL-Error in mobile app log when MS trying to perform LU.
Part of log (full mobile log in attach):
<0001> gsm48_rr.c:355 new state connection pending -> dedicated
<0005> gsm48_mm.c:3911 (ms 1) Received 'RR_EST_CNF' from RR in state wait
for RR connection (location updating) (sapi 0)
<0005> gsm48_mm.c:404 starting T3210 (loc. upd. timeout) with 20.0 seconds
<0005> gsm48_mm.c:924 new state wait for RR connection (location updating)
-> location updating initiated
<0001> gsm48_rr.c:4984 MDL-Error (cause 3) ignoring
<0001> gsm48_rr.c:4987 MDL-Error (cause 3) aborting
<0001> gsm48_rr.c:355 new state dedicated -> idle

In wireshark trace (from OpenBTS, attached) I see that MS sends LURequest
(packet 359) and BTS responds with LUAccept (packet 440) but MS never
receive this message because of error.

As I understand this is "unsolicited UA response" from 08.58 (9.3.22) but I
do not know how to fix that or properly debug.
I'm using latest sylvain/testing and official OpenBTS 2.8. "Usual" (not
with OsmocomBB) phones works with OpenBTS fine and OsmocomBB phones works
fine with "usual" (not OpenBTS) networks.

Thanks,
Pavel
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