Press Record.

http://www.techcrunch.com/2009/11/09/exclusive-google-has-acquired-gizmo5/

Within Google Voice you have the option to point your calls to either a real cell or wired line. In addition the service allows you to direct calls to a Gizmo5 line. This service is compelling for a few reasons.
1. Delivers calls via SIP to my cordless phone running on a Sipura VoIP ATA
2. Provides a backup line for outbound landline calls (with credit)
3. Allows you (at fee) to modify your outbound Caller ID to match my Google Voice number. This allows me to access callback services like MobiVox, Rebtel
4. It completes toll free numbers at no cost - so I can access my conference bridge and services like Google411 and ReQall.

Very interested to see what additional functionality Google brings to the game.