Sec Form 13G Filing - OKUMUS AHMET H filing for CSG SYS INTERNATL INC (CSGS) - 2006-02-06

Insider filing report for Changes in Beneficial Ownership

  • Schedule 13G & 13D forms are used to report a party's ownership of stock which exceeds 5% of a company's total stock issue.
  • Schedule 13G is a shorter version of Schedule 13D with fewer reporting requirements.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 2)*


                         CSG Systems International Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                          Common Stock, par value $0.01
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    126349109
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                                December 31, 2005
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)


     Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

          [_] Rule 13d-1(b)

          [X] Rule 13d-1(c)

          [_] Rule 13d-1(d)

- ----------
*    The remainder of this cover page shall be filled out for a reporting
     person's initial filing on this form with respect to the subject class of
     securities, and for any subsequent amendment containing information which
     would alter the disclosures provided in a prior cover page.

     The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).





CUSIP No.    126349109
            ---------------------


1.   NAME OF  REPORTING  PERSONS
     I.R.S.  IDENTIFICATION  NOS. OF ABOVE  PERSONS (ENTITIES ONLY)

     Ahmet H. Okumus

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE  INSTRUCTIONS)
                                                                (a) [_]
                                                                (b) [X]

3.   SEC USE ONLY



4.   CITIZENSHIP OR PLACE OF ORGANIZATION

     Republic of Turkey

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

5.   SOLE VOTING POWER

     0

6.   SHARED VOTING POWER

     526,275

7.   SOLE DISPOSITIVE POWER

     0

8.   SHARED DISPOSITIVE POWER

     526,275

9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     526,275

10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE
     INSTRUCTIONS)

                                                                    [-]

11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

     1.08%

12.  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

     IN

- --------------------------------------------------------------------------------




CUSIP No.    126349109
            ---------------------


Item 1(a).  Name of Issuer:


            CSG Systems International Inc.
            --------------------------------------------------------------------

      (b).  Address of Issuer's Principal Executive Offices:


            7887 East Belleview Avenue
            Suite 1000
            Englewood, CO 80111

            --------------------------------------------------------------------


Item 2(a).  Names of Persons Filing:


            Ahmet H. Okumus
            --------------------------------------------------------------------

      (b).  Address of Principal Business Office, or if None, Residence:

            850 Third Avenue, 10th Floor
            New York, New York 10022
            --------------------------------------------------------------------

      (c).  Citizenship:

            Ahmet H. Okumus - Republic of Turkey
            --------------------------------------------------------------------

      (d).  Title of Class of Securities:


            Common Stock, par value $0.01 (the "Common Stock")

            --------------------------------------------------------------------

      (e).  CUSIP Number:


            126349109
            --------------------------------------------------------------------


Item 3.     If This Statement is filed pursuant to ss.240.13d-1(b) or
            240.13d-2(b), or (c), check whether the person filing is a:

       (a) [_] Broker or dealer  registered under Section 15 of the Exchange Act
               (15 U.S.C. 78c).

       (b) [_] Bank as defined in Section 3(a)(6) of the Exchange Act (15
               U.S.C. 78c).

       (c) [_] Insurance company as defined in Section 3(a)(19) of the
               Exchange Act (15 U.S.C. 78c).

       (d) [_] Investment company registered under Section 8 of the
               Investment Company Act of 1940 (15 U.S.C. 80a-8).

       (e) [_] An investment adviser in accordance with
               s.240.13d-1(b)(1)(ii)(E);

       (f) [_] An employee benefit plan or endowment fund in accordance with
               s.240.13d-1(b)(1)(ii)(F);

       (g) [_] A parent holding company or control person in accordance with
               Rule 13d-1(b)(1)(ii)(G);

       (h) [_] A savings association as defined in Section 3(b) of the
               Federal Deposit Insurance Act (12 U.S.C.1813);

       (i) [_] A church plan that is excluded from the definition of an
               investment company under Section 3(c)(14) of the Investment
               Company Act of 1940 (15 U.S.C. 80a-3);

       (j) [_] Group, in accordance with s.240.13d-1(b)(1)(ii)(J).

Item 4.     Ownership.

     Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.

       (a)  Amount beneficially owned:

            Ahmet H. Okumus - 526,275
            --------------------------------------------------------------------

       (b)  Percent of class:

            Ahmet H. Okumus - 1.08%
            -------------------------------------------------------------------

       (c)  Number of shares as to which the person has:

            Ahmet H. Okumus

            (i)   Sole power to vote or to direct the vote               0
                                                         ----------------------,


            (ii)  Shared power to vote or to direct the vote       526,275
                                                         ----------------------,


            (iii) Sole power to dispose or to direct the                 0
                  disposition of                         ----------------------,


            (iv)  Shared power to dispose or to direct the            1.08
                  disposition of                         ----------------------.


Item 5.     Ownership of Five Percent or Less of a Class.

     If this  statement  is being  filed to report  the fact that as of the date
hereof the reporting  person has ceased to be the beneficial  owner of more than
five percent of the class of securities, check the following [ X ].


         -----------------------------------------------------------------------


Item 6.     Ownership of More Than Five Percent on Behalf of Another Person.

     If any other person is known to have the right to receive or the power to
direct the receipt of dividends from, or the proceeds from the sale of, such
securities, a statement to that effect should be included in response to this
item and, if such interest relates to more than five percent of the class, such
person should be identified. A listing of the shareholders of an investment
company registered under the Investment Company Act of 1940 or the beneficiaries
of employee benefit plan, pension fund or endowment fund is not required.

            Not applicable.
         -----------------------------------------------------------------------


Item 7.     Identification and Classification of the Subsidiary Which Acquired
            the Security Being  Reported on by the Parent Holding  Company or
            Control Person.

     If a parent holding company or Control person has filed this schedule,
pursuant to Rule 13d-1(b)(1)(ii)(G), so indicate under Item 3(g) and attach an
exhibit stating the identity and the Item 3 classification of the relevant
subsidiary. If a parent holding company or control person has filed this
schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating
the identification of the relevant subsidiary.

            Not applicable.
         -----------------------------------------------------------------------


Item 8.     Identification  and  Classification  of Members of the Group.

     If a group has filed this schedule pursuant to ss.240.13d-1(b)(1)(ii)(J),
so indicate under Item 3(j) and attach an exhibit stating the identity and Item
3 classification of each member of the group. If a group has filed this schedule
pursuant to ss.240.13d-1(c) or ss.240.13d-1(d), attach an exhibit stating the
identity of each member of the group.

            Not applicable.
         -----------------------------------------------------------------------


Item 9.     Notice of Dissolution of Group.

     Notice of dissolution of a group may be furnished as an exhibit stating the
date of the dissolution and that all further filings with respect to
transactions in the security reported on will be filed, if required, by members
of the group, in their individual capacity. See Item 5.

            Not applicable.
          ----------------------------------------------------------------------

Item 10.    Certification.


            By signing  below I certify that, to the best of my knowledge and
            belief,  the  securities  referred to above were not acquired and
            are not held for the purpose of or with the effect of changing or
            influencing  the control of the issuer of the securities and were
            not  acquired  and  are  not  held  in  connection  with  or as a
            participant in any transaction having such purpose or effect.








                                    SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.


Date: February 6, 2006
                                                     /s/ Ahmet H. Okumus **
                                                   -----------------------------
                                                         Ahmet H. Okumus


** The Reporting Persons disclaim beneficial ownership in the Common Stock,
   except to the extent of their pecuniary interest therein.

The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative. If the statement is signed
on behalf of a person by his authorized representative other than an executive
officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
this statement, provided, however, that a power of attorney, for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

Note. Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See s.240.13d-7 for other
parties for whom copies are to be sent.

Attention. Intentional misstatements or omissions of fact constitute federal
criminal violations (see 18 U.S.C. 1001).


SK 21952 0001 639673