JOINT FILING AGREEMENT

   1


                                    EXHIBIT 1

                             JOINT FILING AGREEMENT

                  We, the signature of this Statement on Schedule 13G to which
this Agreement is attached, hereby agree that such Statement is, and any
amendments thereto filed by either of us will be, filed on behalf of each of us.

                                           TEMASEK HOLDINGS (PRIVATE) LIMITED


                                           /s /  XXXXX XXX
                                           -------------------------------------
                                           Name:  Xxxxx Xxx
                                           Title:  Company Secretary
                                           Date:  April 25, 0000


                                           XXXXXXXXX TECHNOLOGIES PTE LTD


                                           / s /  CHUA XX XX
                                           -------------------------------------
                                           Name:  Chua Xx Xx
                                           Title:  Company Secretary
                                           Date:  April 25, 2001



                                           SINGAPORE TECHNOLOGIES
                                           TELEMEDIA PTE LTD


                                           / s / PEK XXXX XXX
                                           -------------------------------------
                                           Name: Pek Xxxx Xxx
                                           Title:  Company Secretary
                                           Date:  April 25, 2001



                                           STT COMMUNICATIONS LTD


                                           / s / PEK XXXX XXX
                                           -------------------------------------
                                           Name: Pek Xxxx Xxx
                                           Title:  Company Secretary
                                           Date:  April 25, 2001



                                           STT VENTURES LTD


                                           / s / PEK XXXX XXX
                                           -------------------------------------
                                           Name: Pek Xxxx Xxx
                                           Title:  Authorized Signatory
                                           Date:  April 25, 2001




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