A communications option value character set,
used by system administrators and end users to specify
the ALTERNATE character set for a communications option
(different from 'xcmGenFixedLocalizationIndex'), so that
'xcmCommsOptionValueString' is unambiguous.
Usage: XCMI conforming management agents shall ONLY allow
Sets of this object to 'other' (none) or 'utf-8' (Unicode/
ISO-10646 in the UTF-8 encoding, a proper superset of US-ASCII),
for consistency with the Xerox Unicode Coherence Standard.