Hi list,<div><br></div><div>I&#39;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.</div><div>Part of log (full mobile log in attach):</div><div><div>

&lt;0001&gt; gsm48_rr.c:355 new state connection pending -&gt; dedicated</div><div>&lt;0005&gt; gsm48_mm.c:3911 (ms 1) Received &#39;RR_EST_CNF&#39; from RR in state wait for RR connection (location updating) (sapi 0)</div>

<div>&lt;0005&gt; gsm48_mm.c:404 starting T3210 (loc. upd. timeout) with 20.0 seconds</div><div>&lt;0005&gt; gsm48_mm.c:924 new state wait for RR connection (location updating) -&gt; location updating initiated</div><div>

&lt;0001&gt; gsm48_rr.c:4984 MDL-Error (cause 3) ignoring</div><div>&lt;0001&gt; gsm48_rr.c:4987 MDL-Error (cause 3) aborting</div><div>&lt;0001&gt; gsm48_rr.c:355 new state dedicated -&gt; idle</div></div><div><br></div>

<div>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.</div><div><br></div><div>As I understand this is &quot;unsolicited UA response&quot; from 08.58 (9.3.22) but I do not know how to fix that or properly debug.</div>

<div>I&#39;m using latest sylvain/testing and official OpenBTS 2.8. &quot;Usual&quot; (not with OsmocomBB) phones works with OpenBTS fine and OsmocomBB phones works fine with &quot;usual&quot; (not OpenBTS) networks.</div>

<div><br></div><div>Thanks,</div><div>Pavel</div>