(19)
(11) EP 1 157 521 A2

(12)

(88) Date of publication A3:
28.12.2000

(43) Date of publication:
28.11.2001 Bulletin 2001/48

(21) Application number: 00916018.5

(22) Date of filing: 01.03.2000
(51) International Patent Classification (IPC)7H04L 29/06
(86) International application number:
PCT/US0005/520
(87) International publication number:
WO 0052/905 (08.09.2000 Gazette 2000/36)
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

(30) Priority: 01.03.1999 US 122481 P
15.04.1999 US 129476 P

(71) Applicant: AT&T Corp.
New York, NY 10013-2412 (US)

(72) Inventors:
  • AIELLO, William, A.
    Madison, NJ 07940 (US)
  • BELLOVIN, Steven, Michael
    Westfield, NJ 07090 (US)
  • KALMANEK, Charles, Robert, Jr.
    Short Hills, NJ 07078 (US)
  • MARSHALL, William, Todd
    Chatham, NJ 07928 (US)
  • RUBIN, Aviel, D.
    West Caldwell, NJ 07006 (US)

(74) Representative: Modiano, Guido, Dr.-Ing. et al
Modiano, Josif, Pisanty & Staub,Baaderstrasse 3
80469 München
80469 München (DE)

   


(54) METHOD AND APPARATUS FOR ENHANCED SECURITY IN A BROADBAND TELEPHONY NETWORK