|Initial release||July 2005(as SIPphone)|
188.8.131.520 (Windows) November 12, 2009, 184.108.40.2069 (Mac) September 24, 2009 , 220.127.116.11 (Linux) June 28, 2010
|Operating system||Mac OS X, Linux, Windows, Internet Tablet OS, Symbian|
|Type||Peer-to-peer internet telephony|
Gizmo5 (formerly known as Gizmo Project and SIPphone) was a Voice over IP communications network and a proprietary freeware soft phone for that network. On November 12, 2009, Google announced that it had acquired Gizmo5. On March 4, 2011, Google announced that the service would be discontinued as of April 3, 2011.
The Gizmo5 network used open standards for call management, Session Initiation Protocol (SIP) and Extensible Messaging and Presence Protocol (XMPP). However, the Gizmo5 client application was proprietary software and used several proprietary codecs, including GIPS and Internet Speech Audio Codec (iSAC).
On November 12, 2009, Google announced that it had acquired Gizmo5 for a reported $30 million in cash. Prior to this acquisition, Gizmo5 had a working relationship with GrandCentral (now Google Voice) for years. Upon announcement, Gizmo5 suspended new signups until a Google relaunch. Google was also dogfooding a Google Voice desktop client based on Gizmo5, branded as Gizmo5 by Google.
Gizmo5 was based on the Session Initiation Protocol and could interoperate with other SIP-based networks directly, including the public switched telephone network. The latter required the Gizmo5 service features CallOut and CallIn. CallOut was available at a fee, whereas CallIn and calls to other VoIP users were generally free of cost. Gizmo5 also used encryption (Secure Real-time Transport Protocol) for network calls and worked well with Phil Zimmermann's Zfone security features.
Gizmo5 supported the following Codecs:
Version 4.0 of the Gizmo5 softphone offered video calls. Gizmo5 also offered smartphone version.
As of July 20, 2009, Gizmo5 was the only SIP service that could be used with Google Voice directly (without requiring a U.S. based phone number).
The text chat function of Gizmo5 utilized the Extensible Messaging and Presence Protocol (XMPP) protocol. Users were addressed by an identification string in the format of email@example.com.
An earlier incarnation of the service was PhoneGaim, a free software VoIP system based on the Pidgin instant messaging software and the SIP protocol handling of the Linphone VoIP software, but restricted to using (only) the SIPphone service. It is available under the GNU General Public License and sponsored by Linspire.
Gizmo5 provided a free voicemail service.
The Gizmo5 mobile phone application used the phone's carrier voice network for all calls. The service called the phone numbers of both parties and bridged the call. On mobile phones that support SIP applications, calls may be placed over WiFi or 3G. In the case of WiFi, calls to Gizmo5 users were free, and calls to the public switched telephone network were charged Gizmo5 Call Out credit. On 3G, additional costs would apply depending on the user's data plan.
On August 26, 2010 Gmail accounts with Google voice were given a function to make and receive calls. Google Voice product manager, Vincent Paquet, confirmed that this function was added through the help of the technology received after the Gizmo5 acquisition.
On Fri, Mar 4, 2011, subscribers received the following message from Gizmo5, indicating that the service would be terminated.
There was no indication made if the service would be revived in another form, or if there would be similar functionality added to any of Google's current telephony offerings. On April 4, around midnight for most users, service was finally cut.[vague]