UNITED STATES
                             SECURITIES AND EXCHANGE COMMISSION
                                   Washington, D.C. 20549

                                          FORM 8-K

                                       CURRENT REPORT
                             Pursuant to Section 13 OR 15(d) of
                            The Securities Exchange Act of 1934

             Date of Report (Date of earliest event reported): October 30, 2006


                      RESIDENTIAL FUNDING MORTGAGE SECURITIES I, INC.,
                        on behalf of the RFMSI Series 2006-SA4 Trust
                   (Exact name of registrant as specified in its charter)

        Delaware                   333-131201-10               75-2006294
--------------------------   --------------------------  -----------------------
--------------------------   --------------------------  -----------------------
     (State or other         (Commission File Number)        (IRS Employer
     jurisdiction of                                      Identification No.)
     incorporation)

8400 Normandale Lake Boulevard, Suite 250
          Minneapolis, Minnesota                            55437
-------------------------------------------    ---------------------------------
-------------------------------------------    ---------------------------------
 (Address of principal executive office)                  (Zip Code)

                                (952) 857-7000
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
             (Registrant's telephone number, including area code )


                                    N/A
                   (Former name or address, if changed since last report)

Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions:

[ ] Written communication  pursuant to Rule 425 under the Securities Act (17 CFR
230.425)

[ ] Soliciting  material  pursuant to Rule 14a-12 under the Exchange Act (17 CFR
240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
Act (17 CFR 240.13e-4(c))


                          Information to be Included in the Report
<PAGE>



Section 8 - Other Events.

ITEM 8.01.  Other Events.

On October 30, 2006,  Residential Funding Mortgage Securities I, Inc. caused the
issuance and sale of the Mortgage Pass-Through  Certificates,  Series, 2006-SA4,
pursuant to a Series  Supplement,  dated as of October 30, 2006, to the Standard
Terms of Pooling and Servicing  Agreement,  dated as of October 30, 2006,  among
Residential Funding Mortgage Securities I, Inc., as company, Residential Funding
Company,  LLC, as master  servicer and the U.S.  Bank National  Association,  as
trustee. The mortgage loans were sold to Residential Funding Mortgage Securities
I,  Inc.  pursuant  to an  Assignment  and  Assumption  Agreement,  dated  as of
October30,  2006,  between  Residential  Funding  Company,  LLC and  Residential
Funding Mortgage Securities I, Inc.

Section 9 - Financial Statements and Exhibits

ITEM 9.01 (d). Exhibits.

(d)  Exhibits:  The  following  execution  copies  of  Exhibits  to the Form S-3
     Registration Statement of the Registrant are hereby filed.

     10.1 Series Supplement, dated as of October 30, 2006, to the Standard Terms
          of Pooling and  Servicing  Agreement,  dated as of October  30,  2006,
          among  Residential  Funding  Mortgage  Securities I, Inc., as company,
          Residential  Funding  Company,  LLC, as master  servicer and U.S. Bank
          National Association, as trustee.

     10.2 Assignment  and  Assumption  Agreement,  dated as of October 30, 2006,
          between,  Residential  Funding  Company,  LLC and Residential  Funding
          Mortgage Securities I, Inc.

     10.3 Custodial  Agreement,  dated as of October 30, 2006, among Residential
          Funding Company, LLC, as master servicer, Residential Funding Mortgage
          Securities  I, Inc.,  as  depositor,  and Wells Fargo Bank,  N.A.,  as
          custodian.

     99.1 Mortgage Loan Schedule


<PAGE>

                                         SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


                             RESIDENTIAL FUNDING MORTGAGE SECURITIES I, INC.


                             By: /s/ Heather Anderson
                             Name:   Heather Anderson
                             Title:  Vice President

Dated:  November 14, 2006

<PAGE>


                                       Exhibit Index


Exhibit No.             Description

     10.1 Series Supplement, dated as of October 30, 2006, to the Standard Terms
          of Pooling and  Servicing  Agreement,  dated as of October  30,  2006,
          among  Residential  Funding  Mortgage  Securities I, Inc., as company,
          Residential  Funding  Company,  LLC, as master  servicer and U.S. Bank
          National Association, as trustee.

     10.2 Assignment  and  Assumption  Agreement,  dated as of October 30, 2006,
          between  Residential  Funding  Company,  LLC and  Residential  Funding
          Mortgage Securities I, Inc.

     10.3 Custodial  Agreement,  dated as of October 30, 2006, among Residential
          Funding Company, LLC, as master servicer, Residential Funding Mortgage
          Securities  I, Inc.,  as  depositor,  and Wells Fargo Bank,  N.A.,  as
          custodian.

     99.1 Mortgage Loan Schedule
[{"type": "8-K", "sequence": "1", "filename": "sa48kss.txt", "secsgml_size_bytes": 5883}]
{"company-data": {"conformed-name": "RFMSI Series 2006-SA4 Trust", "cik": "0001377245", "assigned-sic": "6189", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "333-131201-10", "film-number": "061217480"}, "business-address": {"street1": "8400 NORMANDALE LAKE BLVD", "street2": "SUITE 250", "city": "MINNEAPOLIS", "state": "MN", "zip": "55437", "phone": "9528327000"}}
UNITED STATES
                             SECURITIES AND EXCHANGE COMMISSION
                                   Washington, D.C. 20549

                                          FORM 8-K

                                       CURRENT REPORT
                             Pursuant to Section 13 OR 15(d) of
                            The Securities Exchange Act of 1934

             Date of Report (Date of earliest event reported): October 30, 2006

                      RESIDENTIAL FUNDING MORTGAGE SECURITIES I, INC.,
                        on behalf of the RFMSI Series 2006-SA4 Trust
                   (Exact name of registrant as specified in its charter)

        Delaware                   333-131201-10               75-2006294
--------------------------   --------------------------  -----------------------
--------------------------   --------------------------  -----------------------
     (State or other         (Commission File Number)        (IRS Employer
     jurisdiction of                                      Identification No.)
     incorporation)

8400 Normandale Lake Boulevard, Suite 250
          Minneapolis, Minnesota                            55437
-------------------------------------------    ---------------------------------
-------------------------------------------    ---------------------------------
 (Address of principal executive office)                  (Zip Code)

                                (952) 857-7000
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
             (Registrant's telephone number, including area code )

                                    N/A
                   (Former name or address, if changed since last report)

Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions:

[ ] Written communication  pursuant to Rule 425 under the Securities Act (17 CFR
230.425)

[ ] Soliciting  material  pursuant to Rule 14a-12 under the Exchange Act (17 CFR
240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
Act (17 CFR 240.13e-4(c))

                          Information to be Included in the Report
Section 8 - Other Events.

ITEM 8.01.  Other Events.

On October 30, 2006,  Residential Funding Mortgage Securities I, Inc. caused the
issuance and sale of the Mortgage Pass-Through  Certificates,  Series, 2006-SA4,
pursuant to a Series  Supplement,  dated as of October 30, 2006, to the Standard
Terms of Pooling and Servicing  Agreement,  dated as of October 30, 2006,  among
Residential Funding Mortgage Securities I, Inc., as company, Residential Funding
Company,  LLC, as master  servicer and the U.S.  Bank National  Association,  as
trustee. The mortgage loans were sold to Residential Funding Mortgage Securities
I,  Inc.  pursuant  to an  Assignment  and  Assumption  Agreement,  dated  as of
October30,  2006,  between  Residential  Funding  Company,  LLC and  Residential
Funding Mortgage Securities I, Inc.

Section 9 - Financial Statements and Exhibits

ITEM 9.01 (d). Exhibits.

(d)  Exhibits:  The  following  execution  copies  of  Exhibits  to the Form S-3
     Registration Statement of the Registrant are hereby filed.

     10.1 Series Supplement, dated as of October 30, 2006, to the Standard Terms
          of Pooling and  Servicing  Agreement,  dated as of October  30,  2006,
          among  Residential  Funding  Mortgage  Securities I, Inc., as company,
          Residential  Funding  Company,  LLC, as master  servicer and U.S. Bank
          National Association, as trustee.

     10.2 Assignment  and  Assumption  Agreement,  dated as of October 30, 2006,
          between,  Residential  Funding  Company,  LLC and Residential  Funding
          Mortgage Securities I, Inc.

     10.3 Custodial  Agreement,  dated as of October 30, 2006, among Residential
          Funding Company, LLC, as master servicer, Residential Funding Mortgage
          Securities  I, Inc.,  as  depositor,  and Wells Fargo Bank,  N.A.,  as
          custodian.

     99.1 Mortgage Loan Schedule
SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                             RESIDENTIAL FUNDING MORTGAGE SECURITIES I, INC.

                             By: /s/ Heather Anderson
                             Name:   Heather Anderson
                             Title:  Vice President

Dated:  November 14, 2006
Exhibit Index

Exhibit No.             Description

     10.1 Series Supplement, dated as of October 30, 2006, to the Standard Terms
          of Pooling and  Servicing  Agreement,  dated as of October  30,  2006,
          among  Residential  Funding  Mortgage  Securities I, Inc., as company,
          Residential  Funding  Company,  LLC, as master  servicer and U.S. Bank
          National Association, as trustee.

     10.2 Assignment  and  Assumption  Agreement,  dated as of October 30, 2006,
          between  Residential  Funding  Company,  LLC and  Residential  Funding
          Mortgage Securities I, Inc.

     10.3 Custodial  Agreement,  dated as of October 30, 2006, among Residential
          Funding Company, LLC, as master servicer, Residential Funding Mortgage
          Securities  I, Inc.,  as  depositor,  and Wells Fargo Bank,  N.A.,  as
          custodian.

     99.1 Mortgage Loan Schedule