20-30Gbps UDP 1720 traffic appearing to originate from CN in last 24 hours

Has anyone else seen a massive amount of illegitimate UDP 1720 traffic coming from China being sent towards IP addresses which provide VoIP services? I'm talking in the 20-30Gbps range? The first incident was yesterday at around 13:00 EST, the second incident was today at 09:00 EST. I'm assuming this is just another DDoS like all others, but I would be interested to hear if I am not the only one seeing this. On list or off-list is fine. Thanks, -Drew