Portal Software, Inc. (Pink Sheets:PRSF), the premier global provider of billing and Revenue Management solutions for telecommunications and media markets, today announced that it will hold a conference call to discuss preliminary financial information for the fourth quarter and fiscal 2006 periods on Wednesday, February 8, 2006 at 5:00 p.m. EST/2:00 p.m. PST.

To access the call, please dial in to one of the following numbers at 4:50 p.m. EST/1:50 p.m. PST on February 8, 2006: (800) 706-3415 (inside the US and Canada) or (706) 634-1314 (outside of the US). The conference ID is 5045851. The Portal Software, Inc. financial update call will also be simulcast at the investor relations section of Portal’s web site at www.portal.com.

Additionally, an Internet playback will be available an hour following the call until 12:00 a.m. PST on February 8, 2007 at the investor relations section of Portal’s web site at www.portal.com. A tele-replay of the call also will be available for seven days commencing two hours after the live call. The tele-replay numbers are (800) 642-1687 or (706) 645-9291 and the passcode is 5045851.