Certain Additional Characteristics of the Mortgage Loans Mortgage Rates; Calculations of Interest. The Mortgage Loans bear interest at Mortgage Rates that will remain fixed for their remaining terms. All of the Mortgage Loans accrue interest on the basis of a 360-day year consisting of twelve 30-day months. See "Characteristics of the Ginnie  Mae  Multifamily  Certificates  and  the  Related  Mortgage  Loans"  in  Exhibit  A  to  this Supplement. Due Dates. Monthly payments on the Mortgage Loans are due on the first day of each month. Amortization. The  Mortgage  Loans  are  fully-amortizing  over  their  remaining  terms  to stated maturity. Certain of the Mortgage Loans may provide that, if the related borrower makes a partial  principal  prepayment,  such  borrower  will  not  be  in  default  if  it  fails  to  make  any subsequent  scheduled  payment  of  principal  provided  that  such  borrower  continues  to  pay interest in a timely manner and the unpaid principal balance of such Mortgage Loan at the time of such failure is at or below what it would otherwise be in accordance with its amortization schedule if such partial principal prepayment had not been made. Under certain circumstances, the Mortgage Loans also permit the reamortization thereof if prepayments are received as a result of condemnation or insurance payments with respect to the related Mortgaged Property. Level Payments. Although the Mortgage Loans currently have amortization schedules that provide  for  level  monthly  payments,  the  amortization  schedules  of  substantially  all  of  the Mortgage Loans are subject to change upon the approval of FHA that may result in non-level payments. In the case of Pool Number 612685, the principal and interest payments scheduled to be made on the first business day of each month are as follows: From September 2006 through and including December 2029 ..........................    $31,254.35 From January 2030 through and including December 2044 ................................    $27,594.86 In the case of Pool Number 612695, the principal and interest payments scheduled to be made on the first business day of each month are as follows: From September 2006 through and including October 2030 ..............................    $61,984.69 From November 2030 through and including October 2045................................    $54,357.04 In the case of Pool Number 612701, the principal and interest payments scheduled to be made on the first business day of each month are as follows: From September 2006 through and including September 2030 ..........................    $53,446.80 From October 2030 through and including September 2045 ..............................    $46,520.56 In the case of Pool Number 643468, the principal and interest payments scheduled to be made on the first business day of each month are as follows: From September 2006 through and including March 2012 ..................................    $  2,592.72 From April 2012 through and including March 2036  ............................................    $  1,018.30 In the case of Pool Number 650899, the principal and interest payments scheduled to be made on the first business day of each month are as follows: From September 2006 through and including July 2014 ......................................    $  5,178.76 From August 2014 through and including July 2036..............................................    $  2,352.24 S-12