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

Bogdan-Andrei Iancu bogdan at voice-system.ro
Tue Jun 19 10:08:55 CEST 2007


Hello Jan,

the only way to limit the number of registrations (stored ones) is 
indeed via "max_contacts", but in this case, the newest registration 
attempts will be dropped. I mean this will protect your server, but the 
new Xten will not register anymore.

regards,
bogdan

Jan ONDREJ (SAL) wrote:
> 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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>   





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