(19)

(11)

EP 1 097 557 A1

(12)

(43) Date of publication: 09.05.2001 Bulletin 2001/19 (21) Application number: 99926609.1 (22) Date of filing: 15.06.1999

(51) International Patent Classification (IPC)7: H04M 3/48, H04M 3/51, H04M 3/523 (86) International application number: PCT/GB9901/892 (87) International publication number: WO 0005/867 (03.02.2000 Gazette 2000/05)

(84) Designated Contracting States: BE CH DE ES FR GB IE IT LI NL (30) Priority: 22.07.1998 EP 98305860 (71) Applicant: BRITISH TELECOMMUNICATIONS public limited company London EC1A 7AJ (GB)	(72) Inventor: WILLIAMS, Philip, Mark Ipswich,Suffolk IP4 2RE (GB) (74) Representative: Lidbetter, Timothy Guy Edwin  British Telecommunications PLC,BT Group Legal Services,Int. Prop. Dep.,8th Floor,120 Holborn London EC1N 2TE London EC1N 2TE (GB)