Query on Release. A number portability routing technique (as in MNP) using IN. IN-related MNP uses a database, which is interrogated to identify whether the called number has been ported and, if so, to which destination. QoR allows the calling network to try the donor network (more precisely the “number range owning network�) first - since the vast majority of numbers are not ported. Only if the donor network says “this number has been ported� does the calling network dip into the central database. Contrast the ACQ (All Call Query) technique and the GSM SR (Signaling Relay) technique.
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