VPN9C continues to do a good job on my N9 as far as the opening of web sites and access to all my devices in my home router's net are concerned.
But I got one issue that causes me certain headache:

My vpn server/router at home (FRITZBox 7390) is a multi feature device and is able to serve also as ATA and SIP server for VoIP which is -apart of being a router- is one of the mainly used features.

When my N9 is properly connected to my FRITZ via VPN9C I would like to use this connection also for VoIP calls. The outgoing call is initiated properly from FRITZ just as if I would use a connected DECT phone being at home. I can even hear that the called phone is ringing. But when the other side answers there is absolut silence on my N9 as well as on the phone on the other end.

I know from other forums that VoIP by SIP over VPN is of high interest for many users.
There is no audio problem when i'm doing the same with my 808 where the vpn client configuration is done by NOKIA's own tool.