Abstract
Efficient call routing between voice over Internet Protocol (VoIP) networks and the PSTN is crucial for the success of VoIP. One fundamental problem to be solved is the selection of an appropriate media gateway for calls originating from the VoIP networks and terminating in the PSTN. Media gateways differ in their characteristics. On the PSTN side, they may have different costs for reaching the destination number. On the IP side, the path delay may vary and gateways may provide differing audio qualities due to the availability of different feature sets (e.g., codecs). While a simplistic gateway selection algorithm routes incoming calls solely on the basis of the destination number, an ideal algorithm should be able to make more sophisticated routing decisions (e.g., trading costs against voice quality). In this paper, we motivate the need for such advanced routing algorithms and discuss the issues that surface in the implementation of intelligent media gateway selection algorithms. We further show the benefits of integrating wireless and wireline number portability dips and home location register (HLR) lookups into the routing decision.
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