(19)

(11)

EP 1 330 881 A2

(12)

(88) Date of publication A3: 06.09.2002 (43) Date of publication: 30.07.2003 Bulletin 2003/31 (21) Application number: 01978599.7 (22) Date of filing: 23.10.2001

(51) International Patent Classification (IPC)7: H04B 1/00 (86) International application number: PCT/GB0104/705 (87) International publication number: WO 0203/5712 (02.05.2002 Gazette 2002/18)

(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: 23.10.2000 GB 0025902 (71) Applicant: Sepura Limited Cambridge CB4 1GR (GB)	(72) Inventors: CULLING, Dennis Cambridge CB4 1FD (GB) SPARKS, Geoffrey, Sidney Cambridge CB4 2UJ (GB) (74) Representative: Tothill, John Paul  Frank B. Dehn & Co.179 Queen Victoria Street London EC4V 4EL London EC4V 4EL (GB)