Here is a link to a recent webinar I did back in March on Telephony Denial of Service (TDoS). We did this with one of our partners, iSight. The focus was on dealing with this issue in contact centers.
Here is a link to the webinar I did this week, along with Cisco, on Telephony Denial of Service. You do have to register, but that is a small price to pay :)
Cisco and SecureLogix are presenting a joint webinar, in the morning 6/4, on the topic of Telephony Denial of Service (TDoS) and other UC security threats.
Check out our webinar on threats to contact centers.
I will be participating in a NoJitter webinar on October 10th, on the topic of Voice, VoIP, UC security in contact centers.