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Call waiting (or catch phone in Japan), in telephony, is a feature on some telephone networks. If a calling party places a call to a called party which is otherwise engaged, and the called party has the call waiting feature enabled, the called party is able to suspend the current telephone call and switch to the new incoming call (typically, this is done by pushing the flash button), and can then negotiate with the new or the current caller an appropriate time to ring back. Call waiting, then, alleviates the need to have more than one line for voice communications. ==Star codes *43#== In North America, the NANP uses the *70 star code before a call to suspend call waiting for that call. A stuttered then regular dial tone confirms the de-activation. On most European telephone networks, and GSM or UMTS mobile phones, call waiting is activated by dialing the following codes: * To activate: *43# * To deactivate: #43# * To check status: *#43# A voice announcement, tone or a message on your phone's screen will confirm the service status. Call waiting in Europe uses an "R" (recall) button on the phone. This performs a similar function to a North American hook flash button but is much shorter duration, typically 80ms to 100ms, vs. 250ms in North America. In some networks, pressing R toggles between the calls, similar to North America. However, in most countries there are further options: * R1 – Answer the waiting call and hang up on the current call. * R2 – Toggle between the calls. * R3 – Merge the two calls for conference calling. * R0 – Reject call waiting – This will send the call to voice mail or a busy tone. Type II Caller ID also works with call waiting. 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「call waiting」の詳細全文を読む スポンサード リンク
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