Runtime components : Channels components : SMS handler : Response handler
  
Response handler
SMS response handler is invoked by operation execution task to process the normal reply and exception, and then call outbound handler to send reply SMS message. The response handler gets the reply message from operation context by the field REPLYMSG of SMSConstant, determines the destination phone number from channel context, and then sends out the message to the phone number by invoking the outbound handler.
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SMS handler