(19)

(11)

EP 1 464 142 A2

(12)

(88) Date of publication A3: 04.09.2003 (43) Date of publication: 06.10.2004 Bulletin 2004/41 (21) Application number: 02806278.4 (22) Date of filing: 31.12.2002

(51) International Patent Classification (IPC)7: H04L 12/16 (86) International application number: PCT/US2002/041778 (87) International publication number: WO 2003/058403 (17.07.2003 Gazette 2003/29)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR (30) Priority: 31.12.2001 US 345929 P 01.03.2002 US 360984 P (71) Applicant: Polycom, Inc. Milpitas, CA 95035 (US)	(72) Inventors: RODMAN, Jeffrey San Francisco, CA 94116 (US) DRELL, David Pleasanton, CA 94566 (US) (74) Representative: Käck, Jürgen, Dipl.-Ing.  Kahler Käck MollekopfPatentanwälteVorderer Anger 239 86899 Landsberg 86899 Landsberg (DE)