✎ en:faq:how_to_choose_dtmf_mode [asterCC, hosted call center solution based asterisk]

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====== How to choose dtmf mode ======
===== What is DTMF =====
双音多频 DTMF（Dual Tone Multi Frequency），双音多频，由高频群和低频群组成，高低频群各包含4个频率。一个高频信号和一个低频信号叠加组成一个组合信号，代表一个数字。DTMF信号有16个编码。利用DTMF信令可选择呼叫相应的对讲机。

===== dtmf在系统中的作用 =====
通俗的讲，系统会将用户输入转换成dtmf信号发送出去，当dtmf出现问题时，往往一般表现为用户无法通过按键在语音菜单(IVR)中做出选择。

===== Set DTMF =====
Usually we just need to make sure it's using correct dtmfmode in the trunk. The option is 

dtmfmode=
the options are
  * auto
  * inband
  * info
  * rfc2833

For example
<code>
dtmfmode=rfc2833
</code>

{{:en:faq:dtmfmode.png?300|}}

<note tip>In the default template, astercc is using rfc2833</note>

===== How to config DTMF =====

  * For inbound/outbound, you need to make sure you configured correct dtmfmode same as your provider asked, in most case, use rfc2833
  * When you are using inband, the codec need to be ulaw or alaw