EXHIBIT 5.1

                 [Wilson Sonsini Goodrich & Rosati Letterhead]

                               September 15, 2004


Catapult Communications Corporation
160 South Whisman Road
Mountain View, California 94041

     RE: REGISTRATION STATEMENT ON FORM S-3

Ladies and Gentlemen:

     At your request, we have examined the Registration Statement on Form S-3
(File No. 333-112610) (the "Registration Statement"), filed by Catapult
Communications Corporation, a Nevada corporation (the "Company"), with the
Securities and Exchange Commission in connection with the registration pursuant
to the Securities Act of 1933, as amended (the "Act"), of 1,000,000 shares of
the Company's Common Stock, $0.001 par value per share (the "Primary Shares")
and 3,025,000 shares of the Company's Common Stock, $0.001 par value per share
(the "Secondary Shares" and, together with the Primary Shares, the "Shares"),
which have been previously issued, or are issuable upon the conversion of
outstanding promissory notes as described in the Registration Statement (the
"Notes"), to the selling stockholders named therein.  The Shares are to be sold
in the manner set forth in the Registration Statement, the Prospectus contained
therein (the "Prospectus") and the related supplement to the Prospectus (the
"Prospectus Supplement").

     We have examined the instruments, documents and records that we deemed
relevant and necessary for the basis of our opinion hereinafter expressed.  In
such examination, we have assumed (a) the authenticity of original documents and
the genuineness of all signatures, (b) the conformity to the originals of all
documents submitted to us as copies and (c) the truth, accuracy and completeness
of the information, representations and warranties contained in the records,
documents instruments and certificates we have reviewed.

     On the basis of the foregoing, and in reliance thereon, we are of the
opinion that (i) the Primary Shares, when issued and sold in the manner
described in the Registration Statement, the Prospectus and the Prospectus
Supplement, will be validly issued, fully paid and nonassessable, (ii) the
outstanding Secondary Shares are validly issued, fully paid and nonassessable,
and (iii) the Secondary Shares issuable upon conversion of the Notes, when
issued upon conversion of the Notes in accordance with the terms thereof, will
be validly issued, fully paid and nonassessable.

     We hereby consent to the filing of this opinion as an exhibit to the
above-referenced Registration Statement and to the use of our name wherever it
appears in the Registration Statement, the Prospectus, the Prospectus Supplement
and in any amendment or supplement thereto.  In giving such consent, we do not
believe that we are "experts" within the meaning of such term as used in the Act
or the rules and regulations of the Securities and Exchange Commission issued
thereunder with respect to any part of the Registration Statement, including
this opinion as an exhibit or otherwise.

                                            Sincerely,

                                            WILSON SONSINI GOODRICH & ROSATI
                                            Professional Corporation

                                            /s/ Wilson Sonsini Goodrich & Rosati