Semiconductors; IP private branch exchange telephony systems; telephony computer hardware; telephony computer software; telephony routing products; telephony switching products; products for controlling and managing voice and data traffic over packet-switched networks including IP networks, ATM networks, frame relay networks, UDP networks, RTP networks, local area networks, wide area networks, and global computer networks; telephony devices for converting analog telephone and fax terminals for use over IP networks; voice over IP gateways, which provide private branch exchange capabilities and support for messaging functions, for use in connecting a private branch exchange-based network to an IP-based network; and private branch exchange systems for a multi-tenant building,
Electrical and Scientific Apparatus