1
                                                                    EXHIBIT 23.1
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                         CONSENT OF INDEPENDENT AUDITORS



We consent to the incorporation by reference in the Registration Statement (Form
S-8) pertaining to the 1996 Employee Stock Purchase Plan of our report dated
March 15, 1996, except for Note 10, as to which the date is September 27, 1996,
with respect to the financial statements of International Telecommunication Data
Systems, Inc. for the year ended December 31, 1995 included in its October 24,
1996 Prospectus (Form S-1), filed with the Securities and Exchange Commission.


                                            /s/ Ernst & Young LLP


Stamford, Connecticut
February 5, 1997