I was looking for a device that will enable to me receive telephone calls on my Google Voice number without having to forward it to another (fixed or cellular) voice line. I have found that the best solution for this is the Obi100 and Obi110 products from Obihai.
Obi110 is a VIP telephone adapter that supports dialing and receiving calls over a broadband Ethernet connection. This is a standalone voice bridge device that can be connected to a standard telephone and it does not require a PC. In addition to the broadband connection, Obi110 also supports connection to a regular phone line and it can route call types of your choice (e.g. 911 or local calls) to that line.
One of the best features of the Obi110 is that it can be configured to be used with Google Voice. You can both dial and receive calls on a telephone connected to the OBi device. It is very easy to setup and even easier to use. It does have many other interesting features and the ability to work with other VoIP services (including Obihai’s own Obitalk network) but my guess is that most people in US and Canada will be using it with Google Voice.
Obi100 is the smaller version of the same product without landline support.