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| Yahoo! Voice ： ウィキペディア英語版 |
Yahoo! Voice
Yahoo Voice was Voice over IP PC-PC, PC-Phone and Phone-to-PC service,〔(Yahoo Delivers Phone Out and Phone In Voice Services in the U.S. )〕〔(Yahoo's 'Voice Over IM' Targets Skype )〕 provided by Yahoo via its Yahoo Messenger instant messaging application. Yahoo Voice uses the Session Initiation Protocol (SIP), GIPS codec and the Dialpad engine for voice transport. Since 2008 the service has been provided by JAJAH, an outsourced VoIP provider.〔http://www.marketwire.com/press-release/Jajah-Inc-849374.html JAJAH Selected to Provide Yahoo Premium Voice Service〕 During July 2012, Yahoo voice has been compromised and 453,491 email address and their passwords were hacked. This major devastation was achieved via SQL injection. A 17 MB text file containing the stolen passwords was released by a group of hackers called D33DS company. In relation with this issue, Yahoo advised users to change their passwords as soon as possible.〔(【引用サイトリンク】title=Yahoo Voice Compromised, 450K Login Credentials Stolen & Posted In Plain Text )〕〔(【引用サイトリンク】title=Yahoo Voices Hacked 453,000 Passwords Leaked )〕
In Yahoo Messenger Blog,〔(【引用サイトリンク】title=Change is in the Air: Updates to Yahoo Messenger Features )〕 they announced the end of Yahoo Voice on January 30, 2013.
==Yahoo Phone Out==
PC-to-Phone calls to landlines and mobile phones with the Yahoo Phone Out service (charges apply). Conference calls from PC to Multiple (PSTN) phones or mobiles is currently not supported.
The limitations imposed by packet switched networks, specifically referring to the packet scheduling service (be it over cable, over the air, etc.), introduce a problematic operation since end users do not always use networks that provide real time packet scheduling. This means no priority and significant delays in transmission of data, which causes delays or "holes" in a conversation. The vast majority of users have best effort packet scheduling services for all their data transmission needs and therefore when user demand is high, or the over the air conditions (radio signal strength, interference ratio and BER) are poor, the conversation appears delayed, cut, bad quality, etc. This behavior is not a VoIP specific problem, but business specific or access technology specific (certain technical aspects must be met for non-delayed data transmission), therefore the same problems are found in any type of VoIP solution.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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