Sipura Technology

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Sipura Technology, Inc. is a Voice over IP (VoIP) startup company based in San Jose, California founded on 2003 with its siblings VideoCore and Komodo Technology, Inc. that makes VoIP telephone adapters including the Sipura Phone Adapter (SPA)-2100, SPA-3000, SPA-9000, as well as SPA series IP phones, such as the SPA-941.  Cisco Systems acquired VOIP maker Sipura Technologies for its Linksys division on April 26, 2005, and has since been releasing the SPA series equipment under the Linksys brand.

Products
N.B. Sipura is also marketed under the Linksys brand. SPA-2000: Basic phone adapter that allows two Plain Old Telephone System (POTS) phones or fax machines to be connected to an Ethernet network in order make and receive telephone calls or faxes.
SPA-2100: Similar to the SPA-2000 with the addition of an Ethernet router.  Functions of the built-in router include QoS.
SPA-3000: Has only one phone adapter port, but can be used for POTS backup for strictly VoIP systems.
SPA-3102: Similar to the SPA-3000 but has a single LAN output that can be used to connect to a computer. This is handy if the user only has a modem and no router. The SPA-3102 connects to the LAN socket, on the modem, and then the computer, which was previously connected to the modem, now connects to the LAN connection on the SPA-3102. The SPA-3102, effectively, is an ATA and single output router in one box.
SPA-9000: An IP PBX system that allows an Auto-Attendant configured, Hunt Groups, multiple IP phone extension, and POTS connectors.  The SPA-9000 also has basic router functions, port forwarding, QoS, and DTMF functionality.
SPA-901: A basic IP phone with only one line.  Often referred as a warehouse or kitchen phone.
SPA-921: A single line phone with LCD display screen.
SPA-922: A single line phone with LCD display screen, but adds a single port built in switch.
SPA-941: The flag ship of the SPA phones, this is a 4-line IP phone and LCD display.
SPA-942: The same as the 941, but adds Power-over-Ethernet ability, back-lit to the screen, and a single port built in switch.
SPA-962: A six line, 2-inch color screen, similar in appearance and functionality as the 941/942 phones otherwise.