If wfRsvpSenderAdspecGSSvc is TRUE, this
is the end-to-end composed value for the
guaranteed service 'D' parameter. A return of
zero or noSuchValue indicates one of the fol-
lowing conditions:
the invalid bit was set
the parameter was not present
If wfRsvpSenderAdspecGSSvc is FALSE, this
returns zero or noSuchValue.
UNITS, microseconds