====== send DTMF ======

  * Reques String:
<code>EVENT=SendDtmf&orgidentity=orgidentity&usertype=usertype&user=user&pwdtype=pwdtype&password=password&dtmf=dtmf
</code>
  * Description:
发送DTMF
  * Parameters:

^ Params      ^ Type       ^ Description          ^
|EVENT|String|SendDtmf|
|orgidentity|String|team identity string|
|usertype|String|agent / account|
|user|String|agent No. / username|
|pwdtype|String|password type: plaintext/md5|
|password|String|password|
|dtmf|String|dtmf data, digits, pound and star only|


  * Return format:

<code>
|Retuen|code|Retuen|message
</code>

  * Type of the Return Value:String
  * Return values：

^ Value      ^ Description       ^
|<code>|Retuen|1|Retuen|message</code>|<code>|Retuen|succeed|Retuen|message</code>|
|<code>|Retuen|2|Retuen|message</code>|<code>|Retuen|failed|Retuen|message</code>|