9 Telephone switches and routers; data switches, routers and firewalls; voice-over-ip switches, routers and firewalls; voice-over-ip to plain old telephone service interfaces, switches and routers; voice-over-ip to cellular telephone service interfaces, switches and routers; voice-over-ip software, namely, software to convert voice into digital data packets for transmission over internet protocol (IP) networks to allow conventional telephony instruments to communicate over IP networks; computer telephony software, namely, software to allow data devices such as computers to function as telephony instruments and to provide IP based telephony functionality to such devices