The EcIo onset threshold value. If EcIo goes below the
threshold and the service bit in c3gEcIoOnsetNotifFlag is set,
the c3gEcIoOnsetNotif notification for that service will be
sent. The absolute value of c3gEcIoAbateNotifThreshold should
be less than or equal to the absolute value of
c3gEcIoOnsetNotifThreshold (|c3gEcIoAbateNotifThreshold| <=
|c3gEcIoOnsetNotifThreshold|). e.g. setting
c3gEcIoAbateNotifThreshold to -15 dB and then setting
c3gEcIoOnsetNotifThreshold to -10 dB is not allowed and will
be rejected.