98bf30f6_cess_ATM___Hyosung_Error_Codes__Description
[Code] D1800 [Resolution] Verify that incoming phone line is plugged into “Line” rather than “Phone” on mainboard. Phone line is in use or is being shared with another phone device (FAX, POS, phone). NOTE: This error occurs only if there is no dial tone at the mainboard. [Description] 
No dial tone
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