(19)

(11)

EP 1 192 812 A1

(12)

(43) Date of publication: 03.04.2002 Bulletin 2002/14 (21) Application number: 00953401.7 (22) Date of filing: 16.06.2000

(51) International Patent Classification (IPC)7: H04Q 3/00, H04L 12/66 (86) International application number: PCT/IB0001/236 (87) International publication number: WO 0079/807 (28.12.2000 Gazette 2000/52)

(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: 17.06.1999 US 334961 (71) Applicant: NORTEL NETWORKS CORPORATION Montreal,Quebec H2Y 3Y4 (CA)	(72) Inventor: LIAO, Monling Raleigh, NC 27614 (US) (74) Representative: Loven, Keith James  Loven & CoQuantum House30 Tentercroft Street Lincoln LN5 7DB Lincoln LN5 7DB (GB)