Problem with SGSN Location Update Reject during UE attach

This is merely a historical archive of years 2008-2021, before the migration to mailman3.

A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/osmocom-net-gprs@lists.osmocom.org/.

Lam Ngoc Tuan tuanln at vnpt-technology.vn
Tue Oct 16 10:59:08 UTC 2018


Hello Mr. Neels Hofmeyr

Vielen Dank fuer die schnelle Antwort :-)

Actually we also have seen the "Congestion" in the log but we have not
understood why

We have modified the SGSN configuration: set auth-policy to accept-all.
We repeat the UE attach with this configuration but still MSC sends
"Location Update Reject"

I attach the new pcap file, msc log and sgsn log. I very appreciate if you
can take a look to that.

Vielen Dank
Tuan Lam

-----Original Message-----
From: Neels Hofmeyr [mailto:nhofmeyr at sysmocom.de] 
Sent: Tuesday, October 16, 2018 5:43 PM
To: Lam Ngoc Tuan
Cc: osmocom-net-gprs at lists.osmocom.org
Subject: Re: Problem with SGSN Location Update Reject during UE attach

Actually, the GMM attach doesn't complete, either.

The messages look a bit confusing, with a bunch of Location Updating Accept
followed by a final Location Updating Reject due to "Congestion". The causes
may be

- two simultaneous MM attach requests from the same subscriber,
- timeout after attaching, e.g. phone sends no TMSI Reallocation Complete

It's hard for me to see what is going on there, take a look at the MSC's
logs.

As soon as the MSC attach works out, the phone will continue to try at the
SGSN.

~N
-------------- next part --------------
A non-text attachment was scrubbed...
Name: logs change auth sgsn.rar
Type: application/octet-stream
Size: 24595 bytes
Desc: not available
URL: <http://lists.osmocom.org/pipermail/osmocom-net-gprs/attachments/20181016/396cc57d/attachment.obj>


More information about the osmocom-net-gprs mailing list