[OpenSIPS-Users] How block Register attack

[nick_chang at ezmobo.com]

Hello

I use ngrep watch the proto.
U 2012/01/16 13:34:42.782438 173.0.60.180:5078 -> 10.10.12.70:5060
REGISTER sip:10.10.12.70 SIP/2.0.
Via: SIP/2.0/UDP 173.0.60.180:5078;branch=z9hG4bK-3900389486;rport.
Content-Length: 0.
From: "108" <sip:108 at 10.10.12.70>.
Accept: application/sdp.
User-Agent: friendly-scanner.
To: "108" <sip:108 at 10.10.12.70>.
Contact: sip:123 at 1.1.1.1.
CSeq: 1 REGISTER.
Call-ID: 1312362532.
Max-Forwards: 70.
.

#
U 2012/01/16 13:34:42.782913 173.0.60.180:5078 -> 10.10.12.70:5060
REGISTER sip:10.10.12.70 SIP/2.0.
Via: SIP/2.0/UDP 173.0.60.180:5078;branch=z9hG4bK-4136329935;rport.
Content-Length: 0.
From: "108" <sip:108 at 10.10.12.70>.
Accept: application/sdp.
User-Agent: friendly-scanner.
To: "108" <sip:108 at 10.10.12.70>.
Contact: sip:123 at 1.1.1.1.
CSeq: 1 REGISTER.
Call-ID: 1936335613.
Max-Forwards: 70.
.

#
U 2012/01/16 13:34:42.783353 173.0.60.180:5078 -> 10.10.12.70:5060
REGISTER sip:10.10.12.70 SIP/2.0.
Via: SIP/2.0/UDP 173.0.60.180:5078;branch=z9hG4bK-2752077727;rport.
Content-Length: 0.
From: "108" <sip:108 at 10.10.12.70>.
Accept: application/sdp.
User-Agent: friendly-scanner.
To: "108" <sip:108 at 10.10.12.70>.
Contact: sip:123 at 1.1.1.1.
CSeq: 1 REGISTER.
Call-ID: 3116948484.
Max-Forwards: 70.
.

How to block register attack?

Thanks for your support.
Nick