Fax device type - manufacturer independent.
xcmHrDeviceFax is maintained for legacy products. It is
recommended that the hrDeviceType is explicitly defined using
xcmHrDeviceEmbeddedFax, xcmHrDeviceServerFax or
xcmHrDeviceInternetFax.
An 'xcmHrDeviceFax' device with 'xcmHrDevInfoRealization' of
'physical' is a 'real' I/O device (eg, a 'fax channel' on a
multifunction printer).
An 'xcmHrDeviceFax' device with 'xcmHrDevInfoRealization' of
'logical' is a 'virtual' I/O device (eg, a 'personality' of a
'fax channel' on a multifunction printer).