Simon Telephonics Google Voice Gateway: Create a standard SIP connection to Google Voice
The Google Voice Gateway connects your Google Voice number to any SIP device or URI (incoming calls only). The service adds
these features on top of the features you already get from Google Voice.
Log in to sign up or modify your Gateway connection:

Note: This service requires a full Google account--either a GMail or a Google Apps account (with GMail service).
Please note the following disclaimer: The owner of this web site and VoIP gateway is not responsible
for any misuse of your Google Voice account, SIP registration to the gateway, or Google Voice charges if you route non-free
calls. You are responsible for monitoring your usage on your own switch/PBX and the Google Voice website. Realtime protocol (RTP)
traffic may be sent over the Internet unencrypted. No traffic is monitored at the gateway. This VoIP gateway, the web site,
and the owner of this web site are not affiliated with Google in any way.
THIS SERVICE CANNOT BE USED TO PLACE EMERGENCY CALLS.