SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                                 --------------

                                  SCHEDULE 13D
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)

                               (Amendment No. 1)1

                           CoSine Communications, Inc.
                           ---------------------------
                                (Name of Issuer)

                         Common Stock, $.0001 Par Value
                         ------------------------------
                         (Title of Class of Securities)

                                    221222607
                                    ---------
                                 (CUSIP Number)

                              STEVEN WOLOSKY, ESQ.
                 OLSHAN GRUNDMAN FROME ROSENZWEIG & WOLOSKY LLP
                                Park Avenue Tower
                               65 East 55th Street
                            New York, New York 10022
                                 (212) 451-2300
                                 --------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                  April 14, 2005
                                  --------------
             (Date of Event Which Requires Filing of This Statement)

            If the filing  person has  previously  filed a statement on Schedule
13G to report the  acquisition  that is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(e),  13d-1(f) or 13d-1(g),  check the
following box / /.

            NOTE.  Schedules  filed  in  paper  format  shall  include  a signed
original and five copies of the schedule, including all exhibits. See Rule 13d-7
for other parties to whom copies are to be sent.

                         (Continued on following pages)

                               (Page 1 of 7 Pages)

---------------
1           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 disclosures provided in a prior cover page.

            The  information  required on 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 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. 221222607                   13D                   Page 2 of 7 Pages
-----------------------                                   ----------------------


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

                                         STEEL PARTNERS II, L.P.
--------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) / /
                                                                         (b) / /
--------------------------------------------------------------------------------
     3         SEC USE ONLY

--------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*
                    WC
--------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
               PURSUANT TO ITEM 2(d) OR 2(e)                                 / /
--------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    DELAWARE
--------------------------------------------------------------------------------
  NUMBER OF        7      SOLE VOTING POWER
   SHARES
 BENEFICIALLY                   1,425,248
  OWNED BY
    EACH
 REPORTING
PERSON WITH    -----------------------------------------------------------------
                   8      SHARED VOTING POWER

                                - 0 -
               -----------------------------------------------------------------
                   9      SOLE DISPOSITIVE POWER

                                1,425,248
               -----------------------------------------------------------------
                  10      SHARED DISPOSITIVE POWER

                                - 0 -
--------------------------------------------------------------------------------
    11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
               PERSON

                    1,425,248
--------------------------------------------------------------------------------
    12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
               SHARES*                                                       / /
--------------------------------------------------------------------------------
    13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    14.0%
--------------------------------------------------------------------------------
    14         TYPE OF REPORTING PERSON*

                    PN
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!




-----------------------                                   ----------------------
CUSIP No. 221222607                   13D                   Page 3 of 7 Pages
-----------------------                                   ----------------------


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

                                     STEEL PARTNERS, L.L.C.
--------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) / /
                                                                         (b) / /
--------------------------------------------------------------------------------
     3         SEC USE ONLY

--------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*
                    OO
--------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
               PURSUANT TO ITEM 2(d) OR 2(e)                                 / /
--------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    DELAWARE
--------------------------------------------------------------------------------
  NUMBER OF        7      SOLE VOTING POWER
   SHARES
 BENEFICIALLY                   1,425,248
  OWNED BY
    EACH
 REPORTING
PERSON WITH    -----------------------------------------------------------------
                   8      SHARED VOTING POWER

                                - 0 -
               -----------------------------------------------------------------
                   9      SOLE DISPOSITIVE POWER

                                1,425,248
               -----------------------------------------------------------------
                  10      SHARED DISPOSITIVE POWER

                                - 0 -
--------------------------------------------------------------------------------
    11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
               PERSON

                    1,425,248
--------------------------------------------------------------------------------
    12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
               SHARES*                                                       / /
--------------------------------------------------------------------------------
    13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    14.0%
--------------------------------------------------------------------------------
    14         TYPE OF REPORTING PERSON*

                    OO
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!





-----------------------                                   ----------------------
CUSIP No. 221222607                   13D                   Page 4 of 7 Pages
-----------------------                                   ----------------------


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

                                     WARREN G. LICHTENSTEIN
--------------------------------------------------------------------------------
     2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) / /
                                                                         (b) / /
--------------------------------------------------------------------------------
     3         SEC USE ONLY

--------------------------------------------------------------------------------
     4         SOURCE OF FUNDS*
                    OO
--------------------------------------------------------------------------------
     5         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
               PURSUANT TO ITEM 2(d) OR 2(e)                                 / /
--------------------------------------------------------------------------------
     6         CITIZENSHIP OR PLACE OF ORGANIZATION

                    USA
--------------------------------------------------------------------------------
  NUMBER OF        7      SOLE VOTING POWER
   SHARES
 BENEFICIALLY                   1,425,248
  OWNED BY
    EACH
 REPORTING
PERSON WITH    -----------------------------------------------------------------
                   8      SHARED VOTING POWER

                                - 0 -
               -----------------------------------------------------------------
                   9      SOLE DISPOSITIVE POWER

                                1,425,248
               -----------------------------------------------------------------
                  10      SHARED DISPOSITIVE POWER

                                - 0 -
--------------------------------------------------------------------------------
    11         AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
               PERSON

                    1,425,248
--------------------------------------------------------------------------------
    12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
               SHARES*                                                       / /
--------------------------------------------------------------------------------
    13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                    14.0%
--------------------------------------------------------------------------------
    14         TYPE OF REPORTING PERSON*

                    IN
================================================================================

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!





-----------------------                                   ----------------------
CUSIP No. 221222607                   13D                   Page 5 of 7 Pages
-----------------------                                   ----------------------


            The following constitutes Amendment No. 1 ("Amendment No. 1") to the
Schedule 13D filed by the undersigned.  This Amendment No. 1 amends the Schedule
13D as specifically set forth.

  Item 3 is hereby amended and restated to read as follows:

Item 3.     Source and Amount of Funds or Other Consideration.
            -------------------------------------------------

            The aggregate  purchase price of the 1,425,248 Shares owned by Steel
Partners II is $3,089,101,  including brokerage commissions. The Shares owned by
Steel Partners II were acquired with partnership funds.

  The second  paragraph  of Item 5(a) is hereby  amended and restated to read as
follows:

            As of the close of business  on April 19,  2005,  Steel  Partners II
beneficially  owned 1,425,248 Shares,  constituting  approximately  14.0% of the
Shares  outstanding.  As the general  partner of Steel Partners II, Partners LLC
may be deemed to beneficially  own the 1,425,248  Shares owned by Steel Partners
II,  constituting  approximately  14.0% of the Shares  outstanding.  As the sole
executive  officer and  managing  member of Partners  LLC,  which in turn is the
general  partner  of Steel  Partners  II,  Mr.  Lichtenstein  may be  deemed  to
beneficially own the 1,425,248  Shares owned by Steel Partners II,  constituting
approximately 14.0% of the Shares outstanding.  Mr. Lichtenstein has sole voting
and  dispositive  power with  respect  to the  1,425,248  Shares  owned by Steel
Partners II by virtue of his authority to vote and dispose of such Shares.

  Item 5(c) is hereby amended to add the following:

            (c) Schedule A annexed hereto lists all  transactions  in the Shares
by the Reporting  Persons  since the filing of the initial  Schedule 13D. All of
such transactions were effected in the open market.






-----------------------                                   ----------------------
CUSIP No. 221222607                   13D                   Page 6 of 7 Pages
-----------------------                                   ----------------------


                                   SIGNATURES
                                   ----------

            After  reasonable  inquiry  and to the  best  of his  knowledge  and
belief, each of the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Dated:  April 20, 2005               STEEL PARTNERS II, L.P.

                                     By:  Steel Partners, L.L.C.
                                          General Partner


                                     By: /s/ Warren G. Lichtenstein
                                         ---------------------------------------
                                          Warren G. Lichtenstein
                                          Managing Member


                                     STEEL PARTNERS, L.L.C.


                                      By: /s/ Warren G. Lichtenstein
                                          --------------------------------------
                                          Warren G. Lichtenstein
                                          Managing Member


                                      /s/ Warren G. Lichtenstein
                                      ------------------------------------------
                                      WARREN G. LICHTENSTEIN






-----------------------                                   ----------------------
CUSIP No. 221222607                   13D                   Page 7 of 7 Pages
-----------------------                                   ----------------------


                                   SCHEDULE A
                                   ----------

     Transactions in the Shares Since the Filing of the Initial Schedule 13D
     -----------------------------------------------------------------------

Shares of Common Stock             Price Per                   Date of
       Purchased                   Share($)                   Purchase
       ---------                   --------                   --------

                             STEEL PARTNERS II, L.P.
                             -----------------------
        131,120                    2.2269                     4/14/05
         17,343                    2.1894                     4/18/05

                             STEEL PARTNERS, L.L.C.
                             ----------------------
                                      None

                             WARREN G. LICHTENSTEIN
                             ----------------------
                                      None