I have a Vigor2820 and am runnin it on WAN2 FTTC. I have 4 IP phones and Server and 4 PC's. I loose connection to my SIP Phone service internet weekly :?: and this is repaired by cycling the power on the router. I have been told that the router is forgetting the NAT sessions and so resetting refreshes these. Is there a fix for this as surly this is a problem with he router?

Firmware 3.3.7_232201

I'd go to Draytek support for this one. On the release notes of 3.3.7 the first fix listed is:

Fixed: NAT mechanism causes some NAT related bugs. IP phones behind NAT can't be registered successfully after a while.

Which sounds a lot like what you've described but you've already got this firmware loaded. They may have not fixed this completely.

The only other thing I could suggest is get the newer 3.3.7.1 from the downloads section. There's nothing related mentioned in the release notes but sometimes fixes aren't documented/unintentiaonally fixed by Draytek.

Good luck.