Westermo GDW-11 - Manual (Page 159)

Fax commands 159 6615-2220
+FHNG <cause>
This response reports the hang-up cause. It indicates that the call has been terminated.
<cause>
0: Normal end of connection.
10: Unspecified transmit phase A error.
20: Unspecified transmit phase B error.
40: Unspecified transmit phase C error.
50: Unspecified transmit phase D error.
70: Unspecified receive phase B error.
90: Unspecified receive phase C error.
100: Unspecified receive phase D error.