University of Missouri
Number portability provides users the capability to keep their telephone numbers as they moves to another provider. Number portability technology involves complicated architecture between different providers. From a routing perspective, and in order to simplify the model, the authors consider that the traversal of a call to a ported number may involve three different networks: the originating network, the donor network, and the recipient network. In this paper, they consider four routing schemes, Onward Routing (OR), Query on Release (QoR), Call Dropback/Return to Pivot (CD/RtP), and All Call Query (ACQ) for number portability. They present preliminary results on their performances under various scenarios from a connection setup delay point of view when the rate of portability changes.