Gizmo5 (formerly known as Gizmo Project and SIPphone) was a Voice over IP communications network and a proprietary freeware soft phone for that network.

Michael Robertson (businessman)

Gizmo Project was founded by Michael Robertson and his company SIPphone.
In the years following his departure from Robertson has launched several companies, including Linspire, SIPphone, MP3tunes, and Ajax13.

Google Talk

GTalkGoogle ChatTalk
On April 3, 2011 Google shut down Gizmo5 and recommended users to use Google Talk instead.
This included EarthLink, Gizmo5, Tiscali, NetEase, Chikka, MediaRing, and, according to Google, "thousands of other ISPs, universities, corporations and individual users."

Google Voice

Google VoiceGrand Central
Prior to this acquisition, Gizmo5 had a working relationship with GrandCentral (now Google Voice) for years.
Previously, customers of Gizmo5, a Session Initiation Protocol (SIP) service vendor acquired by Google, were allowed to forward calls to their Gizmo service which may be answered using a free computer application, or a web application, or SIP-based telephone hardware.

Internet Speech Audio Codec

iSACinternet Speech Audio Codec
However, the Gizmo5 client application was proprietary software and used several proprietary codecs, including GIPS and Internet Speech Audio Codec (iSAC).
It is one of the codecs used by AIM Triton, the Gizmo5, QQ, and Google Talk.


MaemoMaemo 5Internet Tablet OS 2008
Bundled applications include the Mozilla-based MicroB browser, Macromedia Flash player, Gizmo5, and Skype.

Internet Low Bitrate Codec

iLBCGIPS codecInternet low Bitrate Codec
It is one of the codecs used by Gizmo5, WebRTC, Ekiga, Google Talk, Maemo Recorder (on the Nokia N800/N810), Polycom IP Phone, Cisco, QuteCom, Tuenti, Yahoo! Messenger, Ooma and many others.

Pidgin (software)

An earlier incarnation of the service was, 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 possible to start a conversation with other users of the same software or any other software that is SIP-compliant such as Gizmo.


Gizmo5 also used encryption (Secure Real-time Transport Protocol) for network calls and worked well with Phil Zimmermann's Zfone security features.

OpenSky service

OpenSky was a service provided by Gizmo5, which is now out of business, to enable communication between users of SIP (Internet standard RFC 3261 ) and users of Skype (which uses a proprietary protocol).

Empathy (software)

EmpathyEmpathy Instant Messenger
Empathy natively supports protocols, implemented in telepathy framework: XMPP (including configuration for Facebook IM, Google Talk, though Gizmo5, LiveJournal Talk, Nokia Ovi and other Jabber servers also supported), salut link-local XMPP for local network peer discovery, MSNP (to Microsoft Messenger service as used by MSN Messenger or Windows Live Messenger), IRC and SIP.

Secure telephone

secure telephonesecure phonesecure telephony
Examples include the Gizmo5 and Twinkle.

Opportunistic encryption

opportunistic encryptionopportunistically signauto-detection
Skype and Amicima use only secure connections and Gizmo5 attempts a secure connection between its clients.

Nokia 770 Internet Tablet

770Nokia 770
The 770 is bundled with applications including the Opera web browser, Macromedia Flash and Gizmo.

List of SIP software

client softwareList of Session Initiation Protocol (SIP) software

List of Internet entrepreneurs

internet entrepreneurInternet entrepreneurstechnology entrepreneur


Its VoIP announcement included mention of a collaboration with Gizmo5, which was formally unveiled in March 2009.

Nokia N810

N810Nokia N810 Internet Tablet Nokia N810WiMAX Edition
The N810 was bundled with several applications including the Mozilla-based MicroB browser, Adobe Flash, Gizmo, and Skype.

Jeff Bonforte

Prior to working for Yahoo he was the President of Gizmo5, which was sold to Google in November 2010.