# Voice USSD related.
config ussd 'send_ussd'
option session_status '0'         # 0: idle, 1: connected
option status '0'                 # 0: waiting_resp
                                  # 1: received_resp
                                  # 2: terminated_by_network
                                  # 3: operation_not_supported
                                  # 4: network_timeout
                                  # 5: error
option response '0'               # response info from network
