This term describes the 9600 series IP Deskphones running SIP firmware. When running SIP firmware, these phones are used as Centralized phones in a Centralized enterprise branch deployment. The following 9600 series phones can run SIP firmware and are supported for use by Centralized users: 9620, 9630, 9640, 9650, 9601, 9608, 9611G, 9621G, and 9641G.