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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

RTCDTMFSender interface's toneBuffer property returns a string containing a list of the DTMF tones currently queued for sending to the remote peer over the RTCPeerConnection . To place tones into the buffer, call insertDTMF() .

Tones are removed from the string as they're played, so only upcoming tones are listed.

句法

var toneBuffer = RTCDTMFSender.toneBuffer;
					

值

A DOMString listing the tones to be played. If the string is empty, there are no tones pending.

Tone buffer format

The tone buffer is a string which can contain any combination of the characters that are permitted by the DTMF standard.

DTMF tone characters

The digits 0-9

These characters represent the digit keys on a telephone keypad.

The letters A-D

These characters represent the "A" through "D" keys which are part of the DTMF standard but not included on most telephones. These are not interpreted as digits. Lower-case "a"-"d" automatically gets converted to upper-case.

The pound/hash sign ("#") and the asterisk ("*")

These correspond to the similarly-labeled keys which are typically on the bottom row of the telephone keypad.

The comma (",")

This character instructs the dialing process to pause for two seconds before sending the next character in the buffer.

All other characters are unrecognized and will cause insertDTMF() to throw an InvalidCharacterError 异常。

Using tone buffer strings

For example, if you're writing code to control a voicemail system by sending DTMF codes, you might use a string such as "*,1,5555". In this example, we would send "*" to request access to the VM system, then, after a pause, send a "1" to start playback of voicemail messages, then after a pause, dial "5555" as a PIN number to open the messages.

Settting the tone buffer to an empty string ( "" ) cancels any pending DTMF codes.

范例

tbd

规范

规范	状态	注释
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'RTCDTMFSender.toneBuffer' in that specification.	候选推荐

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
toneBuffer	Chrome 27	Edge ≤79	Firefox 52	IE 不支持 No	Opera Yes	Safari ?	WebView Android 4.4	Chrome Android 27	Firefox Android 52	Opera Android Yes	Safari iOS ?	Samsung Internet Android 1.5

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

另请参阅

• WebRTC API
• Using DTMF with WebRTC
• RTCDTMFSender.insertDTMF()
• RTCPeerConnection
• RTCDTMFSender
• RTCRtpSender

元数据

• 最后修改： Jan 25, 2020

相关话题

1. WebRTC API
2. RTCDTMFSender
3. 特性

   1. ontonechange
   2. toneBuffer
4. 方法

   1. insertDTMF()
5. 继承：

   1. EventTarget
6. Related pages for WebRTC

   1. MediaDevices.getUserMedia()
   2. Navigator.mediaDevices
   3. RTCCertificate
   4. RTCDTMFToneChangeEvent
   5. RTCDataChannel
   6. RTCDataChannelEvent
   7. RTCDtlsTransport
   8. RTCErrorEvent
   9. RTCIceCandidate
   10. RTCIceTransport
   11. RTCPeerConnection
   12. RTCPeerConnectionIceErrorEvent
   13. RTCPeerConnectionIceEvent
   14. RTCRtpReceiver
   15. RTCRtpSender
   16. RTCRtpTransceiver
   17. RTCSctpTransport
   18. RTCSessionDescription
   19. RTCStatsEvent
   20. RTCStatsReport
   21. RTCTrackEvent