Indicates the reason that the last connection or call attempt disconnected. The meaning of each reason code is explained below: unknown: the failure reason is unknown or there has been no previous call. lostCarrier: the call was disconnected because the loss of carrier. noCarrier: the dial out attempt has failed because the modem detects no carrier. noDialTone: the dial out attempt has failed because the modem failed to detect a dial tone. busy: the call attempt failed because the modem detected a busy signal. modemWatchdogTimeout: the modem internal watchdog timer has expired. dtrDrop: DTR has been turned off while the modem is to disconnect on DTR drop. userHangup: normal disconnect where the user hangs up call. compressionProblem: the call is disconnected due to a problem detected during compression in the modem. retrainFailure: the modem did not successfully train and reach data mode on the previous connections. remoteLinkDisconnect: the remote link disconnected the connection. abort: the call was aborted. inactivityTimeout: the modem automatically hangs up because data is not sent or received within the inactivity time out. dialStringError: the dialed phone number is invalid. linkFailure: the modem detects a link failure. modulationError: the modem detects a modulation error. dialTimeout: the modem times out while attempting to dial. remoteHangup: the remote side hangs up the connection. mnp10ProtocolError: MNP10 Protocol Error. lapmProtocolError: LAPM Protocol Error. faxClass2Error: Fax Class 2 Error. trainupFailure: failure to trainup with a remote peer. fallbackTerminate: User has EC fallback set to disconnect. excessiveEC: Link loss due to excessive EC retransmissions. EC packet transmit limit exceeded. hostDrop: Host initiated link drop. terminate: Lost Carrier Microcom HDMS product relating to password security issues. autoLogonError: An autologon sequence did not complete successfully. ccpNotSeen: The Credit Card Prompt was not detected. callbackFailed: Applies to leased line connection. If after a switched line dialback due to a leased line connection failure, the switched line connection also fails and a connection can still not be made on the leased line, a disconnect occurs with this reason set. blacklist: In coutries that support blacklisting, an attempt was made to go off hook with a null dial string (ATD). lapmTimeout: Timed out waiting for a reply from remote. reliableLinkTxTimeout: Have not received the link acknowledgement in the first 30 seconds of the connection. dspAccessFailure: Timed out trying to access the DSP chip. cdOffTimeout: Timed out waiting for carrier to return after a retrain or rate renegotiation. codewordSizeMismatch: The codeword size are mismatched. dspDownloadFailure: Error during the DSP code download. The time taken to recover and repeat the download would take too long to complete the handshake.