[VoiceOps] Strange register attack

[Colin]

Tonight i'm seeing hundreds of register attempts per second to one of my SBC's from an IP in china 61.142.250.96.  

the From: and to: line is always  one of these 2 below.

\"118\" <sip:118 at my SBC IP>;    source port  5063
\"qwerty\" <sip:qwerty at my SBC IP>;  source port 5067



user-agent: friendly-scanner is always.

Looks like sipvicious default user agent. Anyone seen a register flood like this before?



Colin