Abstract
To reap the benefits of liberalized telecom market, the implementation of number portability (NP) is utmost important. NP allows end user to retain their telephone number in case of change of geographical location or service type or service provider. This paper describes the various number portability routing schemes namely, All Call Query, Query on Release, Call Dropback and Onward routing. The comparative analysis between these routing schemes on various parameters is presented here. The issues pertaining to NP have also been described.
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