Nuera, Derek Li, UA, NUERA-ID, basic
Network Associate Inc.,  Miles Wu,  SIP protocol analyzer, all
Komodo Technology, Sam Sin, UA, Komodo SIP UA, basic
Startek Technologies, Dov Ben-Asher, UA, IPNess SIP, basic
Hughes Software Systems, KS Binu, UA, ProtoQuick(TM) SIP Stack, basic
SS8 Networks, Connie Blanchard, Proxy, SIP Proxy Server, intermediate
Ericsson Utvecklings AB, Eric Turesson, proxy, goSIP, basic
Motorola, Chen Jia, UA, SIP phone, basic
Lucent Technologies IN/Internet Software, Vijay K. Gurbani, proxy, iSIP, basic
Dialogic, Jeff Mark, UA, Ojai, basic
Nuera, Maroula Bratakos, UA, F200SIP, basic
Ericsson, Manuel Sanchez, Proxy, YASS, basic
Iwatsu Electric, Ken Tomitaka, UA, SIP KT, basic
BroadSoft, Sam Hoffpauir/Brett Tate, UA, BroadWorks, basic
VegaStream, Barry Desborough, UA, Vega50 IP Telephony Gateway, basic
Pingtel, Dan Petrie, UA, Xpressa, advanced
Siemens Communications Ltd, Thomas Zimprich, UA, SIP LITE-PHONE, basic
Ubiquity Software Corporation Ltd, Matt Pickard, UA, Helmsman UA, intermediate
Ubiquity Software Corporation Ltd, Neil Deason, proxy, Helmsman SIP Server, advanced
NetSpeak Co., Kevin Wang, proxy,NetSpeak SIP CMS,intermediate
Microappliance, Shiv Haris, proxy, MCET, intermediate
MCI Worldcom, Robert Sparks, UA, VoicePhone, advanced 
Nuera Communications Inc, Henry Lau, UA, NueraSIP API Library, Basic
Vovida Networks,Sunitha Kumar,UA,intermediate
Hewlett-Packard, Anders Kristensen, UA, Wiz, advanced
Hewlett-Packard, Anders Kristensen, proxy, HP SIP server, basic/intermediate
dynamicsoft, Igor Slepchin, proxy, dynamicsoft Proxy, advanced
dynamicsoft, Scott Happell, UA, dynamicsoft C++ UA, basic
dynamicsoft, John Eichelsdorfer, UA, dynamicsoft Java UA, basic
Indigo Software, Emmanuel Bertrand, SIP UA, Indigo User Agent, Intermediate
Indigo Software, Emmanuel Bertrand, SIP proxy, Indigo Proxy Server, Intermediate
Nortel Networks, Scott Orton, UA, Sip Soft Client, advanced 
Nortel Networks, Scott Orton, UA, Sip Phone, advanced 
Nortel Networks, Scott Orton, Proxy, Proxy, intermediate 
Telogy,  Wing Man Kwok,  UA,  Golden Gateway,  Basic
Mediatrix, Eric Tremblay, UA, APA, Advanced
MCI Worldcom ENSD, Steve Donovan, Proxy, NS/RS, Advanced
Columbia University, Jonathan Lennox, Proxy, sipd, Advanced
Columbia University, Xiaotao Wu, UA, sipc, Intermediate