I just tried firmware v3.6.0 on my 2920 and found that my Gigaset VOIP equipment would not maintain its provider registrations. I reverted back to 3.3.7.1 and VOIP is well again, so I guess playing with IPv6 will have to wait.

Does anyone have any other experiences or any configuration ideas?

Hi
I dont have the voip model, just the n but did you try to turn off ipv6 top left, next of auto-log tab if you think is something to do with ipv6?

Thanks and yes, IPv6 was turned off while I was having VOIP provider registration problems.

Just to mention there is a new firmware 3.6.1 at Draytek HQ but i don't have the V model to know if is fix about it

Thank for the news about 3.6.1. I will give it a try.

Thanks again babis3g, at first impression the 3.6.1 is much more VOIP-stable. So far all the several VOIP services are rgistered and are remaining registered instead of flapping up and down as they did under 3.6.0.

I had a minor panic when this upgrade demanded that the workstation client send the firmware file using the Firmware Upgrade Utility, which I had never installed. Previous upgrades had always worked simply with the router/server causing the client's browser to send the data. Fortunately I had previously downloaded this utility and so was able to install it mid-upgrade and while the TFTP server of the router continued to sit and wait for the data.