(19)

(11)

EP 0 908 044 A1

(12)

(43) Date of publication: 14.04.1999 Bulletin 1999/15 (21) Application number: 97926163.0 (22) Date of filing: 10.06.1997

(51) International Patent Classification (IPC):  H04M 3/ 493( . ) H04M 3/ 523( . ) H04M 3/ 51( . ) H04M 7/ 00( . ) (86) International application number: PCT/IB1997/000778 (87) International publication number: WO 1997/050235 (31.12.1997 Gazette 1998/05)

(84) Designated Contracting States: DE FR GB (30) Priority: 24.06.1996 GB 19960013163 (71) Applicant: NORTHERN TELECOM LIMITED Montreal, Quebec H2Y 3Y4 (CA)	(72) Inventors: McGUIRE, Thomas Stephen Claregalway, County Galway (IE) O'SULLIVAN, Barry Salthill, Galway (IE) O'SULLIVAN, Marcus Barna, County Galway (IE) (74) Representative: Cage, John David, et al  Nortel Networks, IP Law Group, London Road Harlow, Essex CM17 9NA Harlow, Essex CM17 9NA (GB)