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   chat    ( 8 )

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HANGUP

The HANGUP options control whether a modem hangup should be
       considered as an error or not.  This option is useful in scripts
       for dialling systems which will hang up and call your system
       back.  The HANGUP options can be ON or OFF.
       When HANGUP is set OFF and the modem hangs up (e.g., after the
       first stage of logging in to a callback system), chat will
       continue running the script (e.g., waiting for the incoming call
       and second stage login prompt). As soon as the incoming call is
       connected, you should use the HANGUP ON directive to reinstall
       normal hang up signal behavior.  Here is an (simple) example
       script:

              ABORT   'BUSY'
              ''      ATZ
              OK\r\n  ATD1234567
              \r\n    \c
              CONNECT \c
              'Callback login:' call_back_ID
              HANGUP OFF
              ABORT "Bad Login"
              'Callback Password:' Call_back_password
              TIMEOUT 120
              CONNECT \c
              HANGUP ON
              ABORT "NO CARRIER"
              ogin:--BREAK--ogin: real_account
              etc ...