Hope someone can help... I'm running a SIP pbx behind my Draytek 2820Vn, and having problems with getting port 5060 to NAT though the firewall rather than being handled by the Draytek.

Everytime an external handset attempts to register with the PBX, the draytek responds with 'Bad Request' (not unreasonable as it's not a pbx!)

I've tried port forwarding (TCP and UDP), but that doesn't seem to want to work on the firewall... is there a way I can persuade the Draytek to ignore 5060 requests from the WAN and behave as you'd expect the NAT to behave?

Thanks in advance,

Hugh