a facility which may be provided on request to a user of the telecommunication network in addition to the normal service provided NOTE - A user facility may be provided on a per call basis or for an agreed period of time. Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=721-18-25
a facility which may be provided on request to a user of the telecommunication network in addition to the normal service provided NOTE - A user facility may be provided on a per call basis or for an agreed period of time.