UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                 PLACECITYWASHINGTON, STATED.C. POSTALCODE20549

                                    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 jurisdiction   (Commission File Number)       (IRS Employer
      of incorporation)                                     Identification No.)

  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))



<PAGE>


                    INFORMATION TO BE INCLUDED IN THE REPORT

SECTION 8 - OTHER EVENTS.

ITEM 8.01.     OTHER EVENTS.


On or about October 30, 2006,  Residential  Funding Mortgage  Securities I, Inc.
will cause 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 U.S. Bank National
Association, as trustee.

In connection with the sale of the Certificates,  Mayer,  Brown, Rowe & Maw LLP,
as counsel to the Registrant, has prepared an opinion on legality and an opinion
on tax matters  (collectively,  the "Opinions") with respect to the Certificates
following the effective date of  Registration  Statement No.  333-131201,  which
Opinions are being filed electronically as exhibits to this report.

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.

               Exhibit 5.1 Opinion on legality of Mayer,  Brown, Rowe & Maw LLP,
                    counsel to the registrant, dated October 30, 2006.

               Exhibit 8.1  Opinion on tax matters of Mayer,  Brown,  Rowe & Maw
                    LLP, counsel to the registrant, dated October 30, 2006.

<PAGE>










                                  Exhibit Index


Exhibit No.           Description

     5.1  Opinion on legality of Mayer,  Brown,  Rowe & Maw LLP,  counsel to the
          registrant, dated October 30, 2006.

     8.1  Opinion on tax matters of Mayer, Brown, Rowe & Maw LLP, counsel to the
          registrant, dated October 30, 2006.
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{"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": "061173961"}, "business-address": {"street1": "8400 NORMANDALE LAKE BLVD", "street2": "SUITE 250", "city": "MINNEAPOLIS", "state": "MN", "zip": "55437", "phone": "9528327000"}}
UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                 PLACECITYWASHINGTON, STATED.C. POSTALCODE20549

                                    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 jurisdiction   (Commission File Number)       (IRS Employer
      of incorporation)                                     Identification No.)

  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 or about October 30, 2006,  Residential  Funding Mortgage  Securities I, Inc.
will cause 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 U.S. Bank National
Association, as trustee.

In connection with the sale of the Certificates,  Mayer,  Brown, Rowe & Maw LLP,
as counsel to the Registrant, has prepared an opinion on legality and an opinion
on tax matters  (collectively,  the "Opinions") with respect to the Certificates
following the effective date of  Registration  Statement No.  333-131201,  which
Opinions are being filed electronically as exhibits to this report.

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.

               Exhibit 5.1 Opinion on legality of Mayer,  Brown, Rowe & Maw LLP,
                    counsel to the registrant, dated October 30, 2006.

               Exhibit 8.1  Opinion on tax matters of Mayer,  Brown,  Rowe & Maw
                    LLP, counsel to the registrant, dated October 30, 2006.
Exhibit Index

Exhibit No.           Description

     5.1  Opinion on legality of Mayer,  Brown,  Rowe & Maw LLP,  counsel to the
          registrant, dated October 30, 2006.

     8.1  Opinion on tax matters of Mayer, Brown, Rowe & Maw LLP, counsel to the
          registrant, dated October 30, 2006.