October 18, 2005

Room 4561

Mr. Terry Gibson
President and CEO
CoSine Communications, Inc.
560 South Winchester Blvd., Suite 500
San Jose, CA 95128

	Re:	CoSine Communications, Inc.
		Preliminary Proxy Statement on Schedule 14A
		Filed October 6, 2005
		File No. 0-30715

Dear Mr. Gibson:

	This is to advise you that we have limited our review of your
filing to the matters addressed in the comments below.  No further
review of the proxy statement has been or will be made.  All
persons
who are by statute responsible for the adequacy and accuracy of
the
proxy statement are urged to be certain that all information
required
under the Securities Exchange Act of 1934 has been included.

      Where indicated, we think you should revise your document in
response to these comments.  If you disagree, we will consider
your
explanation as to why our comment is inapplicable or a revision is
unnecessary.  Please be as detailed as necessary in your
explanation.
In some of our comments, we may ask you to provide us with
supplemental information so we may better understand your
disclosure.
After reviewing this information, we may or may not raise
additional
comments.

	Please understand that the purpose of our review process is
to
assist you in your compliance with the applicable disclosure
requirements and to enhance the overall disclosure in your filing.
We look forward to working with you in these respects.  We welcome
any questions you may have about our comments or any other aspect
of
our review.   Feel free to call us at the telephone numbers listed
at
the end of this letter.

General

1. We note from your Form 10-K for the fiscal year ended December
31,
2004 that you have a subsidiary in Korea.  Please confirm that
such
subsidiary is in South Korea or advise.


*	*	*	*	*

      As appropriate, please amend your filing in response to
these
comments.  You may wish to provide us with marked copies of the
amendment to expedite our review.  Please furnish a cover letter
with
your amendment that keys your responses to our comments and
provides
any requested supplemental information.  Detailed cover letters
greatly facilitate our review.  Please understand that we may have
additional comments after reviewing your amendment and responses
to
our comments.

      We urge all persons who are responsible for the accuracy and
adequacy of the disclosure in the filings reviewed by the staff to
be
certain that they have provided all information investors require
for
an informed decision.  Since the Company and its management are in
possession of all facts relating to a company`s disclosure, they
are
responsible for the accuracy and adequacy of the disclosures they
have made.

	In connection with responding to our comments, please
provide,
in writing, a statement from the Company acknowledging that:

* the Company is responsible for the adequacy and accuracy of the
disclosure in the filing;
* staff comments or changes to disclosure in response to staff
comments in the filing reviewed by the staff do not foreclose the
Commission from taking any action with respect to the filing; and
* the Company may not assert staff comments as a defense in any
proceeding initiated by the Commission or any person under the
federal securities laws of the United States.

   In addition, please be advised that the Division of Enforcement
has access to all information you provide to the staff of the
Division of Corporation Finance in connection with our review of
your
filing or in response to our comments on your filing.

      If you have any questions, please call Sara Kalin at (202)
551-
3454.  If you need further assistance, you may contact me at (202)
551-3730.

 								Sincerely,


								Mark P. Shuman
								Branch Chief-Legal

cc:	Via Facsimile: (408) 788-6929
	Mr. Andrew Pontious, Esq.
??

??

??

??

Mr. Terry Gibson
CoSine Communications, Inc.
October 18, 2005
Page 1