Aberdeen Group
 AMR Research 
 Atlantic-ACM 
 Communications Industry Researchers 
 Current Analysis
 Dell’Oro Group 
 Faulkner Information Services 
 Forrester Research
 Frost & Sullivan
 Funds for Learning
 Gartner Inc.
 Heavy Reading 
 Infonetics Research 
 Insight Research Corp. 
 In-Stat/MDR
 International Data Corp. 
 Jeff Kagan 
 Jupiter Research
 Network Conceptions LLC
 New Paradigm Resources Group 
 Ovum Inc. 
 Pioneer Consulting LLC 
 PointEast Research LLC
 Shosteck Group 
 TeleChoice Inc. 
 Yankee Group 
 Zelos Group