(19)

(11)

EP 0 995 292 A1

(12)

(43) Date of publication: 26.04.2000 Bulletin 2000/17 (21) Application number: 98931767.2 (22) Date of filing: 01.07.1998

(51) International Patent Classification (IPC)7: H04L 12/58, H04M 3/50 (86) International application number: PCT/US9813/731 (87) International publication number: WO 9903/239 (21.01.1999 Gazette 1999/03)

(84) Designated Contracting States: DE FR GB (30) Priority: 07.07.1997 US 888535 (71) Applicant: AT&T Corp. New York, NY 10013-2412 (US)	(72) Inventor: HALL, Robert, J. Berkeley Heights, NJ 07922 (US) (74) Representative: Suckling, Andrew Michael et al Marks & Clerk,Nash Court,Oxford Business Park South Oxford OX4 2RU Oxford OX4 2RU (GB)