2010-05-23 I guess some kind of bug in the sipscann ... 10 years ago
I guess some kind of bug in the sipscanner at 184.108.40.206 got triggered by my firewalling the IP so asterisk does not 'see' the traffic. The incoming traffic is now up to 70 kilobyte/second. It is all ignored, but that is still a fair chunk of incoming bandwidth being eaten.
Update 2010-05-24 I let asterisk answer the requests for a few packets which slowed down the incoming traffic again to something reasonable. And this morning the traffic was gone which suggests somebody read my report to the security contact.