(19)

(11)

EP 1 186 143 A1

(12)

(43) Date of publication: 13.03.2002 Bulletin 2002/11 (21) Application number: 00936312.8 (22) Date of filing: 26.05.2000

(51) International Patent Classification (IPC)7: H04L 12/64, H04M 7/00 (86) International application number: PCT/US0014/467 (87) International publication number: WO 0072/536 (30.11.2000 Gazette 2000/48)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 26.05.1999 US 136213 P (71) Applicant: Nortel Networks Limited St. Laurent,Quebec H4S 2A9 (CA)	(72) Inventors: SMITH, Kevin, R. Allen, TX 75013 (US) EDWARDS, Theodore, E. Plano, TX 75074 (US) WEST, Richard, L. Hendersonville, TN 37075 (US) (74) Representative: Boyce, Conor et al F. R. Kelly & Co.,27 Clyde Road,Ballsbridge Dublin 4 Dublin 4 (IE)