The terminal type string that is sent as a backup to the Telnet server if the server requests this information and doesn't recognize the current value set for SSHTermType.
During negotiations, some hosts that can successfully connect using your preferred terminal type skip over this value during negotiations and connect using the backup value specified by SSHTermDefault. To correct this behavior, set SSHTermDefault to an empty string ("").
The default value for UNIX and OpenVMS, and ReGIS Graphics emulations is "VT100,DEC-VT100".