Gizmo5

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

Michael RobertsonMP3Tunes.com
Gizmo Project was founded by Michael Robertson and his company SIPphone.
In the years following his departure from MP3.com Robertson has launched several companies, including Linspire, SIPphone, MP3tunes, and Ajax13.

Google Talk

Google ChatGTalkchat
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."

Internet Speech Audio Codec

iSAC
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.

Google Voice

Grand 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.

Pidgin (software)

PidginGaimlibpurple
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.
XMPP/Jingle (Google Talk, LJ Talk, Gizmo5, ...)

Internet Low Bitrate Codec

iLBCGIPS codec
iLBC — variable bit rate, loss tolerant, narrow
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.

Zfone

Gizmo5 also used encryption (Secure Real-time Transport Protocol) for network calls and worked well with Phil Zimmermann's Zfone security features.
VoIP Clients - Zfone has been tested with the following VoIP clients: X-Lite, Gizmo5, XMeeting, Google Talk VoIP client, and SJphone.

Maemo

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

QuteCom

QuteCom
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.

Telecommunications network

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

Proprietary software

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

Freeware

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

Softphone

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

Google

Google Inc.Google, Inc.Googling
On November 12, 2009, Google announced that it had acquired Gizmo5.

Session Initiation Protocol

SIPSession Initiation Protocol (SIP)SIP Trunking
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. The Gizmo5 network used open standards for call management, Session Initiation Protocol (SIP) and Extensible Messaging and Presence Protocol (XMPP).

XMPP

JabberExtensible Messaging and Presence ProtocolJabber/XMPP
The Gizmo5 network used open standards for call management, Session Initiation Protocol (SIP) and Extensible Messaging and Presence Protocol (XMPP).

Codec

codecsdecoderdecoders
However, the Gizmo5 client application was proprietary software and used several proprietary codecs, including GIPS and Internet Speech Audio Codec (iSAC).

Global IP Solutions

GIPSGIPS StandardsGlobal IP Sound
However, the Gizmo5 client application was proprietary software and used several proprietary codecs, including GIPS and Internet Speech Audio Codec (iSAC).

Eating your own dog food

dogfoodingeating its own dog foodeating one's own dog food
Google was also dogfooding a Google Voice desktop client based on Gizmo5, branded as Gizmo5 by Google.

Public switched telephone network

PSTNtelephone networkpublic telephone network
Gizmo5 was based on the Session Initiation Protocol and could interoperate with other SIP-based networks directly, including the public switched telephone network.

Secure Real-time Transport Protocol

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

Phil Zimmermann

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

Free software

freefree-softwarefreely
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.

Linphone

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.

GNU General Public License

GPLGNU GPLGPLv2
It is available under the GNU General Public License and sponsored by Linspire.