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Module 2: Product Description

Call Scenarios

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Local Number Portability
This time the diagram illustrates two scenarios for Wireless Long Distance Calls.

Scenario 9

Wireless long distance call outside ported area - Non-conforming IXC:

  1. Mobile Caller F calls long distance to Caller C from inside or outside the MSA.
  2. Commercial Mobile Radio Service (CMRS)-1 is not obligated to determine the LRN, and therefore routes the call to an IXC, typically via a tandem.

  3. IXC-2 is the designated N-1 carrier, and has the responsibility to determine the LRN by performing a "database dip" and routing the call to LEC-2. However, because IXC-2 does not have LNP/LRN capability, IXC-2 will rely on LEC-1 (or LEC-2) to terminate default routed traffic, and LEC-1 (or LEC-2) will perform the actual N-1 function.
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