Telephony Functions
Telephony | Legend
APP uses this function to control call progress, such as accepting an incoming call, putting a hold on a call, or ending an ongoing call. 
APP uses this function to register a callback function to listen to call events. The user_data for the callback function will be provided by the underneath native. 
Start telephony keytone detect. When there is keytone, this callback will be invoked, the interface should be invoke after telephony connected. 
Stop telephony keytone detect. 
Sets Telephony output device. 
Sets Telephony volume level. 
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