(19)

(11)

EP 1 325 619 A2

(12)

(88) Date of publication A3: 23.01.2003 (43) Date of publication: 09.07.2003 Bulletin 2003/28 (21) Application number: 01972263.6 (22) Date of filing: 01.10.2001

(51) International Patent Classification (IPC)7: H04M 11/06 (86) International application number: PCT/GB0104/369 (87) International publication number: WO 0203/0001 (11.04.2002 Gazette 2002/15)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 02.10.2000 US 677214 (71) Applicant: Nortel Networks Limited St. Laurent,Quebec H4S 2A9 (CA)	(72) Inventors: WILLIAMSON, Roger J. Much Hadham,Hertfordshire SG10 6AL (GB) HUMPHREY, Leslie Harlow, Essex CM17 0AR (GB) (74) Representative: Anderson, Angela et al Nortel Networks LimitedIP Law GroupLondon Road Harlow,Essex CM17 9NA Harlow,Essex CM17 9NA (GB)