SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Filed by the Registrant [X]

Filed by a Party other than the Registrant [  ]

Check the appropriate box:

[  ]           Preliminary Proxy Statement

[   ]           Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

[   ]           Definitive Proxy Statement

[ X ]           Definitive Additional Materials

[  ] Soliciting Material Pursuant to Sec. 240.14a-11(c) or Sec. 240.14a-12

Federated Municipal Securities Fund, Inc.

 (Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

[X]           No fee required.

[   ]           Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

1. Title of each class of securities to which transaction applies:

2. Aggregate number of securities to which transaction applies:

3. Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

4. Proposed maximum aggregate value of transaction:

5. Total fee paid:

[   ]           Fee paid previously with preliminary proxy materials.

[   ] Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously.  Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

1)           Amount Previously Paid:

____________________________________________________________

2)           Form, Schedule or Registration Statement No.:

____________________________________________________________

3)           Filing Party:

____________________________________________________________

4)           Date Filed:

____________________________________________________________

Filed by:  Federated Municipal Securities Fund, Inc.

Pursuant to Rule 425 under the Securities Act of 1933 and deemed filed pursuant to Rule 14a-12 of the Securities Act of 1934

Subject Company:  Federated California Municipal Income Fund, portfolio of Federated Municipal Securities Income Trust.

Commission File No. 811-2677

Federated California Municipal Income Fund recently contacted you regarding a Special Meeting of Shareholders to be held on November 20, 2009. The Fund’s records indicate that we have not received your vote. We urge you to vote as soon as possible in order to allow the Fund to obtain a sufficient number of votes to hold the Meeting as scheduled.

1-877-257-9953

Voting is

very important.

Please vote now to be sure your vote is received in time for the November 20, 2009

Special Meeting of Shareholders.

Federated California Municipal Income Fund has made it very easy for you to vote.  Choose one of the following methods:

·   Speak to a live Proxy Specialist by calling the number above.  We can answer any of your questions and record your vote. (open: M-F 9:30am – 9pm, Sat 10am – 6pm ET)

·   Log on to the website noted on your proxy card and enter your control number printed on the card, and vote by following the on-screen prompts.

·   Call the phone number on the proxy card and enter the control number printed on the card and follow the touchtone prompts.

·   Mail in your signed proxy card in the envelope provided.

Voting takes only a few minutes.

PLEASE VOTE TODAY.

Federated Municipal Securities Fund, Inc. (“Federated”) (ICA No.811-2677) filed a prospectus/proxy statement and other relevant documents concerning the planned transaction with the Securities and Exchange Commission (SEC).  INVESTORS ARE URGED TO READ THE PROSPECTUS/PROXY STATEMENT AND OTHER DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE PLANNED TRANSACTION, OR INCORPORATED BY REFERENCE INTO THE PROSPECTUS/PROXY STATEMENT, BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT THE TRANSACTION AND RELATED MATTERS.  These documents are available free of charge on the SEC’s Web site at www.sec.gov.  In addition, documents filed with the SEC by Federated are available free of charge at 1-800-341-7400 or FederatedInvestors.com.CAMIF-R