Thanks for your help. I have a Dutch number via DIDlogic (DID market)., I can actually key in a SIP address for the number and all phone calls to the Dutch number shoudl be received via the SIP number.
In my current setup, I have it linked to my Ekiga SIP address and it works beautiful. However I have tried with Google Voice SIP and Comnet ((registered) for a free account and I don;'t seem to get it to work. Theoretically, if someone can call to a SIP address, one should also be able to forward calls to a sip address in this manner. But it seems there is some blocks. I haven't had real time to sort things out, probably need to get a SIP dialer to test some things.
I logged a question with Comnet and they returned with packages starting at 58 HKD...Using google translate on the Comnet website did give me the 10 HKD deal...I love being a gweilo...