The following were the top 100 private companies to watch in 2006:

Abbeynet
AccessLine Communications
Acme Packet
Aculab
Allot Communications
Apparent Networks
Atreus Systems
BayPackets
BlueSlice Networks
BridgePort Networks
Brix Networks
BroadSoft
BroadVoice
Camfrog
Carbon Twelve
Centile
Cicero Networks
Citel Technologies
Commetrex
Convedia
CTI²
Dialexia Communications
DiamondWare
DigiLinea
Digium
Edgewater Networks
Empirix
Ensim
eStara
Excel Switching
Eyeball Networks
Fonality
Go2Call
Grandstream Networks
Hotsip
I3Micro Technology
Inclarity
Ingate Systems
Interoute
Intertex Data AB
Intoto
IP Unity
IVR Technologies
Jungo Software Technologies
Kayote Networks
KoolSpan
Lignup
LocustWorld
M5 Networks
MailVision
Mediatrix Telecom
Meru Networks
MetaSwitch
Natural Convergence
Netcentrex
Netrake
NewHeights Software
Nextone Communications
Nimcat Networks
OnRelay
Owera
Pactolus Communications Software
Paltalk
Paradial
Peoplecall
Persona Software
Personeta
Pingtel
Popular Telephony
Psytechnics
Quescom
Quintum Technology
Sansay
SIPquest
SkyWave
Sling Media
Snom Technology
SPIRIT DSP
Strix Systems
Surf Communication Solutions
Swyx
Sylantro Systems
SysMaster
TalkSwitch
tekVizion PVS, Inc.
Telchemy
Telepo
Telio
Tellme Networks
Trinity Convergence
VegaStream
Versatel Networks
VidiTel
Vocera Communications
VoicePulse
Vonage
Voxeo
Wavigo
WebMessenger
XConnect