Document:

<PAGE>
                                                                    Exhibit 4.23

                                THIRD AMENDMENT
                                      FOR
                              DEVELOPMENT CONTRACT
                            PSTN EXCELLENCE REGIONAL
                               JUNCTION DIVRE-II

                                    BETWEEN

                         PERUSAHAAN PERSEROAN (PERSERO)
                       PT TELEKOMUNIKASI INDONESIA, TBK.

                                      AND

                         CONSORTIUM OLEX-LUCENT-BRIMBUN

                         NO. PKS.121/HK.820/PEM-00/2002

                            DATED DECEMBER 20, 2002
<PAGE>

                                 THIRD AMENDMENT
                                       FOR
                              DEVELOPMENT CONTRACT
                            PSTN EXCELLENCE REGIONAL
                                JUNCTION DIVRE-II
                                     BETWEEN
                         PERUSAHAAN PERSEROAN (PERSERO)
                       PT. TELEKOMUNIKASI INDONESIA, TBK.
                                       AND
                         CONSORTIUM OLEX-LUCENT-BRIMBUN

                       NUMBER: PKS.121/HK.820/PEM-00/2002

On this TWENTIETH day of DECEMBER year TWO THOUSAND TWO placed at Jakarta,
between the parties :

I.       PERUSAHAAN PERSEROAN (PERSERO) PT. TELEKOMUNIKASI INDONESIA, Tbk.,
         telecommunications services and network provider established and
         incorporated under the law of the Repbulic of Indonesia having its
         registered office at Jalan Japati Number 1 Bandung 40133, based on the
         Power of Attorney of President Director Number : K.TEL
         107/HK510/UTA-00/02 dated 15 August 2002 in this Amendment duly
         represented by TRI DJATMIKO, in his capacity AS HEAD OF DEVELOPMENT
         DIVISION, hereinafter referred to as TELKOM.

II.      CONSORTIUM OLEX - LUCENT - BRIMBUN, a consortium formed by Notaries
         Deed No. 9 dated 14th December 2001, in front of Notary Benny Djaja,
         SH, SE, MM., having its address at Wisma Bisnis Indonesia 15th Floor,
         Jl. Lerjen S. Parman Kav. 12, Jakarta-11480 whereas in this legal act
         to be represented by FADJAR TJOANDA, as President Director of PT. Olex
         Cables Indonesia,

         CONSORTIUM OLEX - LUCENT - BRIMBUN consist of:

<PAGE>

         PT. OLEX CABLES INDONESIA, having its address at Wisma Bisnis Indonesia
         15th Floor, Jakarta, as CONSORTIUM LEADER, hereinafter referred to as
         OLEX.

         PT LUCENT TECHNOLOGIES INDONESIA, having its address at Tifa Building
         3th Floor, Jakarta, as CONSORTIUM MEMBER, hereinafter referred to as
         LUCENT.

         PT. BRIMBUN RAYA INDAH, having its address at Jakarta Barat, as
         CONSORTIUM MEMBER, hereinafter referred to as BRIMBUN.

         hereinafter all together in this Amendment referred to as PARTNER.

By first taking into consideration of the following matters:

a.       whereas, TELKOM and PARTNER has been bound each other in Development
         Contract PSTN Excellence Regional Junction DIVRE II Number:
         PKS.14/HK.810/UTA-00/2002 dated 8 February 2002, hereinafter referred
         to as "MAIN CONTRACT";

         b.       whereas, TELKOM and PARTNER has changed some articles in the
                  Main Contract as described in First Amendment for Development
                  Contract PSTN Excellence Regional Junction Divre-II Number :
                  PKS. l55/HK.820/UTA-00/2002 dated 22 August 2002, hereinafter
                  referred to as "FIRST AMENDMENT";

         c.       whereas, TELKOM and PARTNER has changed some articles in the
                  Main Contract and First Amendment as described in Second
                  Amendment for Development Contract PSTN Excellence Regional
                  Junction Divre-II Number: PKS. l92/HK.820/UTA-00/2002 dated 25
                  October 2002, hereinafter referred to as "SECOND AMENDMENT";

                                        2

<PAGE>

         d.       whereas, in the implementation of it and in order to optimize
                  the Project, some additions and reductions of works are
                  avoidable as have been depicted in the Minute of Meeting of
                  ATTACHMENT III AND ATTACHMENT IV.

After having taken into consideration the above matters, TELKOM and PARTNER have
agreed to amend the provisions stipulated in the Main Contract, First Amendment,
and Second Amendment in accordance with the following terms and conditions:

                                    ARTICLE 1
                                  SCOPE OF WORK

To Amend letter a sub Article ( 2 ) Article 1 (Scope of Work) of the second
Amendment become the following condition:

a.       Implementation of PSTN Excellence Junction DIVRE-II in accordance with
         the result of survey, design and Design Review Meeting (DRM) as
         specified in ATTACHMENT I of this Amendment, which in principal,
         consists of development of System RINGs and other work:

         1)       RING   X,
         2)       RING   Y,
         3)       RING   1,
         4)       RING   2,
         5)       RING   3,
         6)       RTN6   4,
         7)       RING   5,
         8)       RING   6,
         9)       RING   7,
         10)      RING   8,
         11)      RING   9,
         12)      RING  10,
         13)      RING  11
         14)      RING  12
         15)      RING  13
         16)      RING  14
         17)      RING  15
         18)      Network Management Systems (NMS)
         19)      Spare
         20)      Training DXC
         21)      Training SDH
         22)      Supporting Facilities

                                        3

<PAGE>

                                    ARTICLE 2
                                 CONTRACT AMOUNT

To amend sub-article (1) and (2) Article 2 (Contract Amount) of the Second
Amendment become as follows;

(1)      Value of WORK for this Amendment is amounting USD$26,244,788.53 (TWENTY
         SIX MILLION TWO HUNDRED FORTY FOUR THOUSAND SEVEN HUNDRED EIGHTY EIGHT
         US DOLLAR AND FIFTY THREE CENTS) AND RP. 110,281,732,400 (ONE HUNDRED
         TEN BILLION TWO HUNDRED EIGHTY ONE MILLION SEVEN HUNDRED THIRTY TWO
         THOUSAND FOUR HUNDRED RUPIAH) EXCLUDING 10% VAT consists of:

                                        4

<PAGE>

<TABLE>
<CAPTION>
                                 US D                  IDR                   US D               IDR
                               SEBELUM              SEBELUM PPn             SESUDAH          SESUDAH PPn
NO      (SCOPE OF WORK)        PPn 10%                  10%                 PPn 10%             10%
-----------------------------------------------------------------------------------------------------------
<S>  <C>                    <C>                 <C>                      <C>             <C>
1    Ring X                  8,163,779.07        21,841,279,800.00        8,980,156.98    24,025,407,760.00
2    Ring Y                  4,327,516.66        19,312,515,100.00        4,760,268.54    21,243,766,610.00
3    Ring 1                  2,704,036.26        16,447,514,600.00        2,974,439.89    18,092,266,060.00
4    Ring 2                  1,134,022.00         2,330,941,700.00        1,247,424.20     2,564,035,870.00
5    Ring 3                  1,105,277.00         2,406,408,500.00        1,215,804.70     2,647,049,350.00
6    Ring 4                  1,755,768.00         3,119,467,500.00        1,931,344.80     3,431,414,250.00
7    Ring 5                  1,439,308.62        13,935,903,500.00        1,583,239.49    15,329,493,850.00
8    Ring 6                    290,477.00         1,045,649,800.00          319,524.70     1,150,214,780.00
9    Ring 7                    452,546.00         2,379,013,500.00          497,000.60     2,616,914,850.00
10   Ring 8                     51,122.86         1,003,281,100.00           56,235.15     1,103,609,210.00
11   Ring 9                    286,296.00         1,009,257,500.00          314,925.60     1,110,183,250.00
12   Ring 10                   242,580.42         1,630,089,300.00          266,838.46     1,793,098,230.00
13   Ring 11                   526,171.29         1,448,933,100.00          578,788.42     1,593,826,410.00
14   Ring 12                   345,060.11         1,946,302,900.00          379,566.12     2,140,933,190.00
15   Ring 13                   264,170.24         1,528,089,700.00          290,587.27     1,680,898,670.00
16   Ring 14                   500,096.63         5,897,287,300.00          550,106.29     6,487,016,030.00
17   Ring 15                   760,960.16         7,766,009,900.00          837,056.17     8,542,610,890.00
18   NMS                     1,364,093.00         4,602,492,100.00        1,500,502.30     5,062,741,310.00
19   Spare                     413,113.00            55,459,600.00          454,424.30        61,005,560.00
20   Supporting Facilities              -           263,835,900.00                   -       290,219,490.00
21   Training SDH              118,394.00                        -          130,233.40                    -
22   Training DXC                       -           312,000,000.00                   -       343,200,000.00
                            -------------       ------------------       -------------   ------------------
     TOTAL PROYEK           26,244,788.53       110,281,732,400.00       28,869,267.38   121,309,905,640.00
                            -------------       ------------------       -------------   ------------------
</TABLE>

(2)  Value of the WORK for this Amendment is as specified in detailed in
     Attachment I of this Amendment.

                                       5
<PAGE>

                                   ARTICLE 3
                         CONTRACT IMPLEMENTATION PERIOD

         To amend sub-article (1) of Article 3 (Contract Implementation Period)
of the Second Amendment, becomes as follows:

(1)      TELKOM and PARTNER agree to implement the WORK under Article 1(Scope of
         Work) of this Amendment, which finalization of the Work as summarized
         below:

<TABLE>
<CAPTION>
 No          Scope of Work                                 Finish
-----------------------------------------------------------------------
<S>       <C>                                        <C>
 1        Ring X                                     27 December 2002
 2        Ring Y                                       26 March 2003
 3        Ring 1                                       27 June 2003
 4        Ring 2                                      22 August 2003
 5        Ring 3                                      22 August 2003
 6        Ring 4                                      7 November 2003
 7        Ring 5                                       18 July 2003
 8        Ring 6                                     19 December 2003
 9        Ring 7                                      9 January 2004
10        Ring 8                                     14 November 2003
11        Ring 9                                     20 February 2004
12        Ring 10                                    20 February 2004
13        Ring 11                                    20 February 2004
14        Ring 12                                      12 March 2004
15        Ring 13                                      19 March 2004
16        Ring 14                                      19 March 2004
17        Ring 15                                       19 March 2004
18        NMS                                          31 March 2003
19        Spare                                        26 March 2004
20        Supporting Facilities                      30 November 2002
21        Training SDH                                 25 July 2003
22        Training DXC                               05 February 2003
</TABLE>

                                   ARTICLE 4
                                    PAYMENT

To amend sub-article (4) latest sentence of Article 9 (Payment) of the Second
Amendment, become as follows:

In accordence with the payment amount belongs to the right of the names above,
where the bank transfer fee shall be imposed to the names above by auto
deduction from the paid amount as specified in Attachment I and Attachment VI of
this Amendment.

<PAGE>

                                    ARTICLE 5
                           QUALITY ASSURANCE GUARANTEE

To amend sub-article (1) Article 12 (Quality Assurance Guarantee) or the second
Amendment, become the following condition :

(1)      PARTNER is responsible to submit Maintenance Guarantee Bond to TELKOM
         cq. GM DIVPEM AREA II Jakarta issued by an Indonesian State Owned Bank
         or a reputable International Bank amounting 5 % (five percent) of
         Contract Amount excluded VAT 10 % of the Work of the RING, Network
         Management System (NMS) or Supporting Facilities which has been
         completed totally as discribed in Article 2 of this Amendment and
         having validity for 1 (one) year after signing date or Provisional
         Acceptance Certificate (PAC).

                                    ARTICLE 6
                                   ATTACHMENT

All attachment as follows shall be an unity that could not be separated of this
Amendment, consist of :

Attachment I:
         BoQ and Price Table of DRM

Attachment II:
         Telkom's approval letter

Attachment III :
         Minutes OF Meetings and Clarification of Supporting Facilities

Attachment IV:
         Clarifications of Addition and Reduction of Work

Attachment V:
         Telkom's approval on Extention Implementation for Supporting Facilities
         and Training DXC/LC

Attachment VI :
         Disbursement Plan

                                        7

<PAGE>

                                    ARTICLE 7
                                     OTHERS

(1)      This Amendment shall become effective as of the date after signing by
         both parties.

(2)      Articles and / or Attachments of the Main Contract, first Amendment and
         Second Amendment which are not emended by this Amendment, shall remain
         prevail and legally binding to both parties.

(3)      Copy from this Original Amendment was made in 25 (twenty five) copies
         by PARTNER on PARTNER's own cost for the purpose of supervision of
         Implementation and others.

In witness whereof, both parties have agreed to sign this Amendment as the Third
Amendment.

Signed by, for and on behalf of:

<TABLE>
<S>                                               <C>
PT. TELEKOMUNIKASI INDONESIA, Tbk,                     KONSORSIUM
                                                  OLEX-LUCENT-BRIMBUN,
        /s/ Tri Djatmiko
        ----------------                                [STAMP]

          TRI DJATMIKO                             /s/ Fadjar Tjoanda
    ------------------------                       ------------------
    KEPAL DIVISI PEMBANGUNAN
                                                     FADJAR TJOANDA
                                                   -------------------
                                                   PIMPINAN KONSORSIUM
</TABLE>

                                        8<PAGE>
                                                                    Exhibit 4.24

                                FOURTH AMENDMENT
                                      FOR
                              DEVELOPMENT CONTRACT
                            PSTN EXCELLENCE REGIONAL
                               JUNCTION DIVRE-II

                                    BETWEEN

                         PERUSAHAAN PERSEROAN (PERSERO)
                       PT TELEKOMUNIKASI INDONESIA, TBK.

                                      AND

                         CONSORTIUM OLEX-LUCENT-BRIMBUN

                         NO. PKS.21/HK.820/PEM-00/2003

                              DATED MARCH 20, 2003
<PAGE>

                                FOURTH AMENDMENT
                                       FOR
                              DEVELOPMENT CONTRACT
                            PSTN EXCELLENCE REGIONAL
                                JUNCTION DIVRE-II
                                     BETWEEN
                         PERUSAHAAN PERSEROAN (PERSERO)
                       PT. TELEKOMUNIKASI INDONESIA, TBK.
                                       AND
                         CONSORTIUM OLEX-LUCENT-BRIMBUN
                       NOMOR: PKS. 21/HK.820/PEM-00/2003

On this TWENTIETH day of MARCH, year TWO THOUSAND THREE placed at jakarta,
between the concerned parties:

I.       PERUSAHAAN PERSEROAN (PERSERO) PT. TELEKOMUNIKASI INDONESIA, TBK.,
         telecommunications services and network provider established and
         incoporated under the law of Republic of Indonesia, having its address
         at jalan japati No. 1 Bandung 40133, in this legal act represent by,
         TRI DJATMIKO, HEAD OF DEVELOPMENT DIVISION, based on the Power of
         Attorney of President Director Number : K.TEL. 107/HK510/UTA-00/02
         dated 15 August 2002, hereinafter referred to as TELKOM.

II.      CONSORTIUM OLEX - LUCENT - BRIMBUN, a consortium formed by Notaries
         Deed No. 9 DATED 14th December 2001, in front OF Notary Benny Djaja,
         SH, SE, MM., having its address at Wisma Bisnis Indonesia 15th Floor,
         JL. Letjen S. Parman Kav. 12, Jakarta-11480 whereas in this legal act
         to be represented by FADJAR TJOANDA, as President Director OF PT. Olex
         Cables Indonesia,

         CONSORTIUM OLEX - LUCENT - BRIMBUN consist of:

         PT. OLEX CABLES INDONESIA, having its address at Wisma Bisnis Indonesia
         15th Floor, Jakarta, as CONSORTIUM LEADER, hereinafter referred to as
         OLEX.

                                        1
<PAGE>

         PT LUCENT TECHNOLOGIES INDONESIA, having its address at Tifa Building
         3rd Floor, Jakarta, as CONSORTIUM MEMBER, hereinafter referred to as
         LUCENT.

         PT. BRIMBUN RAYA INDAH, having its address at Jakarta Barat, as
         CONSORTIUM MEMBER, hereinafter referred to as BRIMBUN.

         hereinafter all together in this Amendment referred to as PARTNER.

By first taking into Consideration of the following matters:

a.       whereas, TELKOM and PARTNER has been bound each other in Development
         Contract PSTN Excellence Regional Junction DIVRE II Number:
         PKS.14/HK810/UTA-00/2002 dated 8 February 2002, hereinafter referred to
         as "MAIN CONTRACT".

b.       whereas, TELKOM and PARTNER has changed some articles in the Main
         Contract with the first Amendment Nomor PKS. 155/HK-820/UTA-00/2002
         dated August 22, 2002, hereinafter referred to as "FIRST AMENDMENT";
         Second Amendment Nomor PKS. 192/HK-820/UTA-00/2002 dated October 25,
         2002, hereinafter referred to as "SECOND AMENDMENT"; Third Amendment
         Nomor PKS. 121/HK-820/PEM-00/2002 dated December 20, 2002, hereinafter
         referred to as "THIRD AMENDMENT".

c.       whereas, TELKOM and PARTNER have agreed to amend the Scope of Work and
         the Period of Implementation Time for several RINGs;

d.       whereas TEKOM with it's Letter number : Tel. 232/LG.270/PEM-99/2003
         dated March 19,2003 has agreed with Amendment IV;

                                        2
<PAGE>

After having taken into consideration the above matters, TELKOM and PARTNER
have agreed to amend the provisions stipulated in the Main Contract, First
Amendment, Second Amendment and third Amendment in accordance with the following
terms and conditions :

                                    ARTICLE 1
                                  SCOPE OF WORK

(1)      TELKOM and PARTNER have agreed to amend the Bill of Quantity (BoQ) of
         the scope of work and added the new RING that was ACCELERATED OF RING
         Y;

(2)      Scope of Work based on this Amendment as specified in detail as stated
         in attachment-II of this Amendment.

                                    ARTICLE 2
                                 CONTRACT AMOUNT

(1).     The contract price based on this Amendment including VAT, insurance and
         other taxes based on the law of Indonesia as follows :

         -    US $ 28,806,714.68 (Twenty eight million eight hundred six
              thousand seven hundred forteen United States Dollar and
              sixty-eight cents) and

         -    RP. 122.488.631.870,- (One hundred twenty-two billion four hundred
              eighty-eight million six hundred thirty-one thousand eight hundred
              seventy Indonesian Rupiah)

(2).     The contract price per-ring system and it's breakdown as stated in
         appendix II of this Amendment.

                                        3
<PAGE>

                                    ARTICLE 3
                           TIME IMPLEMENTATION PERIOD

(1)      TELKOM and PARTNER have agreed to amend the Period of Time
         Implementation for several RINGs, and the last RING should be completed
         on March 19, 2004.

(2)      The Schedulle of Time implementation for each RINGS as specified in
         detail as mentioned in Attachment-III of this Amendment.

                                    ARTICLE 4
                                   ATTACHMENT

All attachment as follows shall be an unity that could not be separated of this
Amendment consist of:

Attachment-I :

         Approval letter from TELKOM

Attachment-II :

         Price summary Schedule

Attachment-III :

         Implementation Schedule

Attachment-IV:

         Disburment Plan

Attachment-V:

         Minutes of Meeting (Design Review Meeting, Clarification & Negotiation)

                                    ARTICLE 5
                                     OTHERS

(1)      This Amendment shall become effective as of the date after signing by
         both parties.

(2)      Articles and / or Attachments of the Main Contract and its Amendments
         which are not amended by this Amendment, shall remain prevail and
         legally binding by both parties.

                                        4
<PAGE>

(3)      Copy from this Original Amendment was made in 25 (twenty five) copies
         by PARTNER on PARTNER'S own cost for the purpose of supervision of
         implementation and others.

  PT. TELEKOMUNIKASI INDONESIA, Tbk                       KONSORSIUM
                                                     OLEX-LUCENT BRIMBUN,

                                                          [STAMPED]

  By: /s/ Tri Djatmiko                                By: /s/ Fadjar Tjoanda
      -------------------                                 ----------------------
       TRI DJATMIKO                                         FADJAR TJOANDA
 KEPALA DIVISI PEMBANGUNAN                                PIMPINAN KONSORSIUM

                                        5

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