We may have just seen the reasoning behind Google's announcement last week that they were shutting down VoIP service Gizmo5. Apparently a SIP address has surfaced that allows those with an SIP-to-SIP account (such as sip2sip.info) to call Google Voice users for free. While this may not sound Earth-shattering at first, this is most likely an early sign that true Google Voice VoIP (that many users have been eagerly anticipating) is on its way.
The VoIP company Gizmo5, which was purchased by Google in 2009, is going to be officially ending its service next month (April 3 to be exact). Many Android users who have a setup which utilizes Gizmo5's compatibility with Google Voice to make cheap or free internet calls will need to look elsewhere for cheap VoIP calling.
An email (submitted by Reddit user Bizurke) from Gizmo5 cites the Gmail calling service as a viable replacement after notifying users of the termination.