I'm trying to connect some sip phones to our PBX. The worked fine for about 10 minutes and then they lost connection. I needed to disable sip helpers to get them to register in the first place but now they wont register at all, but I do see this line in my firewall logs over and over again:
[dsnat: in:wan out:(unknown 0), src-mac 184.108.40.206.33.44, proto TCP (SYN), 220.127.116.11:519111->192.168.20.10:5060, len 60]
where 18.104.22.168 is our public ip
where 192.168.20.10 is the address of our Wan
and our internal ip subnet is 192.168.0.0
It seems like voip traffic is not getting to our Lan.