Attempts to hack Asterisk – What do these lines means

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In another email I’ve just responded to, it might pay to consider
http://www.emergingthreats.net/index.php/rules-mainmenu-38.html

Alec Davis

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From: href=”mailto:asterisk-users-bounces@lists.digium.com”>asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of bruce bruce
Sent: Sunday, 3 October 2010 7:59 a.m.
To: Asterisk Users Mailing List – Non-Commercial Discussion
Subject: [asterisk-users] Attempts to hack Asterisk – What do these lines
means

Hi Everyone,

Like always, here are IPs from China that try to hack an Asterisk server.
Can someone please explain what is happening or what the hacker is trying to
reach:

02/10/2010 11:10 SIP/113.105.152.51-000000fb sip “sip” s ANSWERED 13
02/10/2010 11:10 SIP/113.105.152.51-000000fe sip “sip” s ANSWERED 13
02/10/2010 11:10 SIP/113.105.152.51-000000fc sip “sip” s ANSWERED 13
02/10/2010 11:10 SIP/113.105.152.51-000000fd sip “sip” s ANSWERED 13
02/10/2010 11:10 SIP/113.105.152.51-000000ff sip “sip” s ANSWERED 13
02/10/2010 11:10 SIP/113.105.152.51-00000100 sip “sip” s ANSWERED 13
02/10/2010 11:17 SIP/222.73.204.198-00000101 sip “sip” s ANSWERED 13
02/10/2010 11:17 SIP/222.73.204.198-00000102 sip “sip” s ANSWERED 13
02/10/2010 11:17 SIP/222.73.204.198-00000103 sip “sip” s ANSWERED 13
02/10/2010 11:17 SIP/222.73.204.198-00000104 sip “sip” s ANSWERED 13
02/10/2010 11:17 SIP/222.73.204.198-00000105 sip “sip” s ANSWERED 13
02/10/2010 11:17 SIP/222.73.204.198-00000106 sip “sip” s ANSWERED 13
02/10/2010 11:17 SIP/222.73.204.198-00000107 sip “sip” s ANSWERED 13
02/10/2010 11:17 SIP/222.73.204.198-00000108 sip “sip” s ANSWERED 13
02/10/2010 11:17 SIP/222.73.204.198-00000109 sip “sip” s ANSWERED 13

Thanks