[Users] too many branches for latest X-lite 3

Jan ONDREJ (SAL) ondrejj at salstar.sk
Wed Jun 13 15:21:13 CEST 2007


Hello,

  I have problems with too many branches for latest X-Lite release 1011s
stamp 41150. Other phones are working properly. X-Lites are trying to
subscribe each 40 seconds with different rinstance strings. Example:

mysql> select contact,last_modified from location where username='1538' order by last_modified;
+-----------------------------------------------------------+---------------------+
| contact                                                   | last_modified       |
+-----------------------------------------------------------+---------------------+
| sip:1538 at 158.197.240.237:51092;rinstance=897b6ff9462755eb | 2007-06-13 14:17:41 | 
| sip:1538 at 158.197.240.237:51092;rinstance=059223be49bdc5a4 | 2007-06-13 14:18:21 | 
| sip:1538 at 158.197.240.237:51092;rinstance=e3b22d920bdd9b61 | 2007-06-13 14:19:00 | 
| sip:1538 at 158.197.240.237:51092;rinstance=163058af66fd3b21 | 2007-06-13 14:19:39 | 
| sip:1538 at 158.197.10.104:5060                              | 2007-06-13 15:10:01 | 
+-----------------------------------------------------------+-------------------

After some time there is 30-90 subscriptions for some users (not for all
users of X-lite, but only for lastest Xlite).

After some time openser is sending many SUBSCRIBE requests to these users
and eats all of CPU, my calls are very slow.

I am now trying to play with "max_contacts" registrar parameter set to 5.
Is it a problem of X-lite and how to prevent these DOS attacks from wrong
softphones?

Thank you.

				SAL




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