<PAGE>
EXHIBIT 23.3
------------
CONSENT OF INDEPENDENT AUDITORS
We consent to the incorporation by reference in the Registration Statement (Form
S-8) of Net2Phone, Inc. ("Net2Phone") for the registration of 5,370,218 shares
of its common stock pertaining to its 1999 Amended and Restated Stock Option and
Incentive Plan, of our report dated September 29, 2000 with respect to the
financial statements of Net2Phone included in its Annual Report (Form 10-K) for
the year ended July 31, 2000, filed with the Securities and Exchange Commission.
ERNST & YOUNG LLP
New York, New York
December 1, 2000
