SECURITIES & EXCHANGE COMMISSION
                           WASHINGTON, D.C.  20549

                                 FORM 12b-25

                         Notification of Late Filing

                           ULTRADATA SYSTEMS INC.


                        Commission File Number 0-25380

(Check one)
   [X] Form 10-K and Form 10-KSB   [ ]  Form 11-K   [ ]   Form 20-F

   [ ] Form 10-Q and Form 10-QSB   [ ]  Form N-SAR  [ ]   Form N-CSR

       For the period ended:  December 31, 2005


   [ ] Transition Report on Form 10-K and Form 10-KSB

   [ ] Transition Report on Form 20-F

   [ ] Transition Report on Form 11-K

   [ ] Transition Report on Form 10-Q and Form 10-QSB

   [ ] Transition Report on Form N-SAR

       For the transition period ended:
                                          -------------

Nothing in this form shall be construed to imply that the Commission has
verified any information contained herein.

If the notification relates to a portion of the filing checked above, identify
the item(s) to which the notification relates:

                                  PART I
                          REGISTRANT INFORMATION


  Full name of Registrant       ULTRADATA SYSTEMS, INC.
                                -----------------------------------

  Former name, if applicable
                                -----------------------------------

             1240 Dielman Industrial Court, St. Louis, MO   63132
             ----------------------------------------------------
                    Address of principal executive office

                                 PART II

If the subject report could not be filed without unreasonable effort or
expense and the registrant seeks relief pursuant to Rule 12b-25(b), the
following should be completed. (Check box if appropriate)  [X]



  (a) The reasons described in reasonable detail in Part III of this form could
not be eliminated without unreasonable effort or expense;
  (b) The subject annual report, semi-annual report, transition report on Form
10-K 10-KSB, 20-F, 11-K, Form N-SAR or Form N-CSR, or portion thereof will be
filed on or before the 15th calendar day following the prescribed due date; or
the subject quarterly report or transition report on Form 10-Q, 10-QSB,or
portion thereof will be filed on or before the fifth calendar day following the
prescribed due date; and
  (c) The accountant's statement or other exhibit required by Rule
12b-25(c) has been attached if applicable.

                                 PART III
                                NARRATIVE

Ultradata Systems, Inc. is unable to file its Annual Report on Form
10-KSB within the required time because there was a delay in completing the
adjustments necessary to close its books for the year.

                                 PART IV
                            OTHER INFORMATION

(1) Name and telephone number of person to contact in regard to this
notification:

                       Ernest Clarke  314-997-2250

(2) Have all other periodic reports required under Section 13 or 15(d) or the
Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of
1940 during the preceding 12 months or for such shorter period that the
registrant was required to file such report(s) been filed. Yes [X]   No [ ]

(3) Is it anticipated that any significant change in results of operations
from the corresponding period for the last fiscal year will be reflected by
the earnings statements to be included in the subject report or portion
thereof.                                                   Yes [ ]   No [X]

If so, attach an explanation of the anticipated change, both narratively and
quantitatively, and, if appropriate, state the reasons why a reasonable
estimate of the results cannot be made.

                           ULTRADATA SYSTEMS, INC.
               ______________________________________________
               Name of Registrant as Specified in its Charter

Has caused this notification to be signed on its behalf by the undersigned
thereunto duly authorized.

Date: March 31, 2006                By: /s/ Ernest Clarke
                                    __________________________
                                    Ernest Clarke
                                    President