[Freeswitch-users] nf_ct_sip dropped packets?

Hi, I keep seeing that packets are being dropped every few days from a yealink phone. The phone has made calls, and I don't see dropped packets in my logs during most of the successful call. FS is on a public IP, the phone is behind nat. I don't know if this is actually a problem, but I'm concerned about this error message because I don't know what it is. Is iptables rate-limiting something..? Situataion, kern.log error, iptables/ufw list: http://pastebin.freeswitch.org/17156 Thanks! -Avi