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Sipdroid is a voice over IP (internet protocol, VoIP) application for the Android operating system using the Session Initiation Protocol.〔(Sipdroid Website )〕 Sipdroid is free and open source software released under the GNU General Public License.〔 == History == The sipdroid open source project was started in svn on March 12, 2009〔https://code.google.com/p/sipdroid/source/detail?r=1〕 by the project author pmerle71. It reached version 1.0 on July 12 of the same year.〔https://code.google.com/p/sipdroid/source/detail?r=172〕 More recent major releases are: 1.5 (May 29, 2010) with improved video quality, 2.0 (November 18, 2010) with the ability to link to a google voice account, 2.2 (March 25, 2011) with the ability to send video sms messages, 2.7 (May 21, 2012) with improved low-latency capability, and 3.0 (April 22, 2013) with support for TLS. In 2010-2011 it gained popularity partially because of its ability to work with Google's Google Voice service, making calls to traditional telephone numbers while only using the data network. However, after Google Voice removed the ability to connect over SIP on March 8, 2011〔http://www.onsip.com/blog/2011/03/08/google-voice-sip-address-no-longer-available-sipvoicegooglecom-now-silent〕 this functionality was no longer available. Since this time, sipdroid has been used with many different native SIP deployments and is given as the default android SIP client by some vendors.〔http://www.voipvoip.com/sipdroid/〕 As of January 5, 2014, it is listed on the google play store as having 1,000,000-5,000,000 installations 〔https://play.google.com/store/apps/details?id=org.sipdroid.sipua&hl=en〕 and has been reviewed by nearly 10,000 people. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sipdroid」の詳細全文を読む スポンサード リンク
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