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Exhibit 10.1.2
 Amendment No. 51 (NE)
    
    
    
    January 1, 2006SOW:
    
    o NoþYes
  
    
    LNP, LLC (Midwest)
    
    Southwest Region Portability Company, LLC
    
    Western Region Telephone Number Portability, LLC
    
    Southeast Number Portability Administration Company, LLC
    
    Mid-Atlantic Carrier Acquisition Company, LLC
    
    West Coast Portability Services, LLC
 [Graphic Omitted: NeuStar Logo]
 STATEMENT OF WORK NO. 51
 UNDER
 CONTRACTOR SERVICES AGREEMENT
 FOR
 NUMBER PORTABILITY ADMINISTRATION CENTER / SERVICE
MANAGEMENT SYSTEM
 MODIFICATION TO EXHIBIT G AND EXHIBIT N
  CONFIDENTIAL




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Amendment No. 51 (NE)
    
    
    
    January 1, 2006SOW:
    
    o NoþYes
 STATEMENT OF WORK NO. 51
UNDER
CONTRACTOR SERVICES AGREEMENT
FOR
NUMBER PORTABILITY ADMINISTRATION CENTER/SERVICE 
MANAGEMENT SYSTEM  Modification to Exhibit G and Exhibit N
 1.0
    
    PARTIES
 SOW Master Agreement Master Agreements Contractor Customer Subscribing Customer
 2.0
    
    EFFECTIVENESS AND DEFINED TERMS
 st Statement of Work Effective Date Subscribing Customers
 
    
    LNP, LLC (Midwest)
    
    Mid-Atlantic Carrier Acquisition Company, LLC
    
    Northeast Carrier Acquisition Company, LLC
    
    Southeast Number Portability Administration Company, LLC
    
    Southwest Region Portability Company, LLC
    
    West Coast Portability Services, LLC
    
    Western Region Telephone Number Portability, LLC
  3.0
    
    CONSIDERATION RECITAL
   CONFIDENTIAL




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Amendment No. 51 (NE)
    
    
    
    January 1, 2006SOW:
    
    o NoþYes
  4.0
    
    MODIFICATIONS TO EXHIBIT G4.1
    
    Background
 FRS
 1.
    
    Customer executes this SOW51 on behalf of all Subscribing Customers.2.
    
    Contractor revised the SLR Methods & Procedures document to reflect the changes to
Exhibit G as set forth herein.3.
    
    Customer and Contractor approve GEP Metrics Document revised to reflect the changes to
Exhibit G as set forth herein.4.
    
    GEP Auditor revises GEP Audit Plan to reflect the changes in the GEP Metrics Document
as set forth above.
  4.2
    
    SLR 5 Change
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Amendment No. 51 (NE)
    
    
    
    January 1, 2006SOW:
    
    o NoþYes
  4.3
    
    SLR 6 Change
    5.0
    
    RESCISSION OF EXHIBIT N5.1
    
    Background
  5.2
    
    Rescission of Exhibit N
   CONFIDENTIAL




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Amendment No. 51 (NE)
    
    
    
    January 1, 2006SOW:
    
    o NoþYes
  6.0
    
    APPLICABLE DOCUMENTS
  None
 None
 None
 None
 None
 None
 None
 None
 7.0
    
    IMPACTS ON MASTER AGREEMENT
 None
 None
 None
 None
 None
 þ
 None
 None
 None
 None
 None
 þ
 None
 None
 þ
 8.0
    
    COMPENSATION AND PAYMENT8.1
    
    Allocable Charges
  9.0
    
    MISCELLANEOUS
 9.1
    
    Except as specifically modified and amended hereby, all the provisions of the Master
  CONFIDENTIAL




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Amendment No. 51 (NE)
    
    
    
    January 1, 2006SOW:
    
    o NoþYes
      [THIS SPACE INTENTIONALLY LEFT BLANK]
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Amendment No. 51 (NE)
    
    
    
    January 1, 2006SOW:
    
    o NoþYes
  CONTRACTOR: NeuStar, Inc.
 By:
Its:
    
    /s/ Joe Franlin

Sr. VP Customer RelationsDate: 6/6/06
 CUSTOMER: North American Portability Management LLC, as successor in interest to and on behalf of
the Northeast Carrier Acquisition Company, LLC
 By:
Its:
    
    /s/ Melvin Clay

Co-ChairDate: May 23, 2006By:
Its:
    
    /s/ Suzanne Howard

Co-ChairDate: 6/1/06
  CONFIDENTIAL