Answer / manish yadav

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Trace » Blog Archive » MNP Call Flow-Routing of A Call to a
Ported Number – Telecom Sector|CDMA GSM
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a-ported-number/#ixzz17qGupKq6


Typical steps of MNP call flow – Inter Circle Scenario:
–A call originated from a PSTN switch or a mobile
originated call is first queried at local NPDB by MSC/GMSC.

–Routing number is returned to GMSC which performs the
digit analysis to determine an out of Circle call and
routes the call to the National long distance Operator
(NLDO).
–NLDO transports the call to the entry point of the
terminating Circle.
–NLDO routes the call to the terminating Operator based on
RN.
–terminating Operator on receiving the call, queries HLR
for location information of subscriber.
–HLR queries VLR and request routing information.
–VLR returns the appropriate routing information.
–HLR responds to the GMSC with routing information.
–GMSC then use the routing information to route to the
appropriate VMSC.

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