THE PHILADELPHIA STOCK EXCHANGE TO BEGIN TRADING OPTIONS ON SONUS NETWORKS, INC. ON WEDNSDAY, NOVEMBER 24

For more information, contact Barbara Sorid at 215-496-5200 or by e-mail

PHILADELPHIA – Nov. 23, 2004 - The Philadelphia Stock Exchange (PHLX) announced today that it will begin trading options on Sonus Networks, Inc. on Wednesday, November 24.

Sonus Networks, Inc. (Nasdaq symbol: UJS/SONS) has been allocated to Knight Financial Products, LLC. It will trade on the January expiration cycle with initial expirations months of December, January, April and July. Position and Exercise limits have been set at 7,500,000 shares.

The Philadelphia Stock Exchange (PHLX) was founded in 1790. The PHLX trades more than 2,200 stocks, 1,016 listed equity options, 12 sectors index options and currency pairs. For more information about the PHLX and its products, visit www.phlx.com.

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