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Google Voice is a telephony service that provides call forwarding and voicemail services, voice and text messaging , as well as US and international call termination services for Google Account customers.〔(【引用サイトリンク】title=About Google Voice )〕 The service was launched by Google on March 11, 2009, after the company had acquired the service GrandCentral. Google Voice provides a U.S. telephone number, chosen by the user from available numbers in selected area codes, free of charge to each user account. Calls to this number are forwarded to telephone numbers that each user must configure in the account web portal. Multiple destination may be specified that ring simultaneously for incoming calls. Service establishment requires a United States telephone number. A user may answer and receive calls on any of the ringing phones as configured in the web portal. During a received call the user may switch between the configured telephones.〔 Users may place outbound calls to domestic and international destinations. Calls may be initiated from any of the configured telephones, as well as from a mobile device app, or from the account portal. As of August 2011, users in many other countries also may place outbound calls from the web-based application to domestic and international phone numbers. Many other Google Voice services—such as voicemail, free text messaging, call history, conference calling, call screening, blocking of unwanted calls, and voice transcription to text of voicemail messages—are also available to .〔(【引用サイトリンク】 url = http://www.google.com/googlevoice/about.html )〕 In terms of product integration, transcribed and audio voicemails, missed call notifications, and/or text messages can optionally be forwarded to an email account of the user's choice. Additionally, text messages can be sent and received via the familiar email or IM interface by reading and writing text messages in Gmail or by adding contact's phone numbers in Google Talk respectively (PC-to-Phone texting). Google Voice multi-way videoconferencing (with support for document sharing) is now integrated with Google+ Hangouts.〔(【引用サイトリンク】 url = http://www.google.com/+/learnmore/hangouts/ )〕 The service is configured and maintained by the user in a web-based application, styled after Google's e-mail service, Gmail, or with Android and iOS apps on smart phones or tablets. Google Voice provides free PC-to-phone calling within the United States and Canada, and PC-to-PC voice and video calling worldwide between users of the Google+ Hangouts browser plugin (available for Windows, Intel-based Mac OS X, and Linux).〔(【引用サイトリンク】 title=Google voice and video chat )〕 Almost all domestic and outbound calls to the United States (including Alaska and Hawaii) and Canada〔A few domestic calls are also billed at $0.01 per minute.〕 are free from the U.S. and Canada, and $0.01 per minute from everywhere else.〔(【引用サイトリンク】title=Google Voice: Calling Rates )〕 International calls are billed according to a schedule posted on the Google Voice website.〔(【引用サイトリンク】url=https://www.google.com/voice/rates#C )〕 , Google Voice had approximately 1.4 million users, of which 570,000 used the service 7 days a week. This number has risen markedly since Google made the transition of its Google Voice service from "invitation only" to be available to all Gmail subscribers in the United States. A Wired blog post quoted a figure of 3.5 million in 2013. ==Overview== Google, via Gmail , provides free PC-to-PC voice (and, optionally, also video, which has been around much longer) calling worldwide. As described above, Google Voice users in many countries may make low-cost calls to international phone numbers, and may also make free PC-to-phone calls within the United States and Canada. This service will remain free at least until the end of 2013.〔(【引用サイトリンク】title=Google Voice will be free for 2013 )〕 A Google Voice local phone number for incoming calls is available only for users in the United States.〔(【引用サイトリンク】title=Google Voice invitation request, )〕 Users may select a single U.S. phone number from various area codes. Incoming calls to the number may ring simultaneously any of the user's configured phones or the account's Google Talk feature. Based on the calling number, or contact group (e.g., Family, Friends, Work), or on time of day (e.g., disabling a home phone during business hours and routing calls to mobile or business number), individual numbers may be configured to ring. The service also features voicemail with indexable automated voicemail transcription, accessible via a web browser, e-mail, or by phone. Google Voice provides automatic blocking of known numbers, e.g., telemarketers, the ability to switch lines in mid-call, differentiated voice mail greetings based on caller, Short Message Service (SMS) forwarding, and call recording. 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.〔(【引用サイトリンク】title=Gizmo5 browser-based telephony application )〕 Google discontinued Gizmo5 service on April 3, 2011. There are several competing virtual number services. Personal numbering services have been available in the United Kingdom since 1993, similar to the AT&T True Connections 500 service offered in the 1990s in the United States. AT&T's service required the direct involvement of AT&T to change the phone number list, while the Google service is user-configurable on the web application. The original voice of GrandCentral and Google Voice belonged to actress and voice-over artist, Laurie Burke (), but has been replaced with recordings by Kiki Baessell, a Googler who had no experience in professional voice-overs, but was chosen because of her pleasant, familiar voice. 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「Google Voice」の詳細全文を読む スポンサード リンク
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