(19)

(11)

EP 0 853 859 A1

(12)

(43) Date of publication: 22.07.1998 Bulletin 1998/30 (21) Application number: 97934623.0 (22) Date of filing: 31.07.1997

(51) International Patent Classification (IPC):  H04M 3/ 42( . ) H04Q 3/ 00( . ) H04Q 3/ 72( . ) H04M 3/ 436( . ) H04M 3/ 533( . ) (86) International application number: PCT/GB1997/002075 (87) International publication number: WO 1998/006223 (12.02.1998 Gazette 1998/06)

(84) Designated Contracting States: DE ES IT SE (30) Priority: 03.08.1996 GB 19960016381 (71) Applicant: GPT LIMITED Coventry, CV3 1HJ (GB)	(72) Inventor: WINCH, Nicholas, Richard Coventry CV3 6PW (GB) (74) Representative: Branfield, Henry Anthony, et al  The General Electric Company, p.l.c. GEC Patent Department Waterhouse Lane Chelmsford, Essex CM1 2QX Chelmsford, Essex CM1 2QX (GB)