(19)

(11)

EP 0 221 962 A1

(12)

(43) Date of publication: 20.05.1987 Bulletin 1987/21 (21) Application number: 86903147.0 (22) Date of filing: 26.05.1986

(51) International Patent Classification (IPC):  H04Q 11/ 04( . ) (86) International application number: PCT/AU1986/000149 (87) International publication number: WO 1986/007228 (04.12.1986 Gazette 1986/26)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 24.05.1985 AU 19850000720 (71) Applicant: XITEL PTY LIMITED Canberra City ACT 2601 (AU)	(72) Inventor: DAVIS, Barrie, William Canberra, ACT 2617 (AU)