(19)

(11)

EP 0 734 633 A1

(12)

(43) Date of publication: 02.10.1996 Bulletin 1996/40 (21) Application number: 95903430.0 (22) Date of filing: 16.12.1994

(51) International Patent Classification (IPC):  H04Q 3/ 00( . ) (86) International application number: PCT/GB1994/002752 (87) International publication number: WO 1995/017075 (22.06.1995 Gazette 1995/26)

(84) Designated Contracting States: BE CH DE DK ES FR GB IT LI NL SE (30) Priority: 16.12.1993 EP 19930310182 (71) Applicant: BRITISH TELECOMMUNICATIONS public limited company London EC1A 7AJ (GB)	(72) Inventors: BAKER, Stephen, Charles British Columbia V6G 1Y8 (CA) CRABTREE, Ian, Barry Ipswich Suffolk IP9 2NN (GB) (74) Representative: Dutton, Erica L. G., et al  BT Group Legal Services, Intellectual Property Department, 8th Floor, Holborn Centre 120 Holborn London EC1N 2TE London EC1N 2TE (GB)