Archisoft International
- Developers of Envox 4 (formerly ct studio), a tool to couple Telephony and Computing.
- http://www.archisoftint.com/envox_us

Sipient Systems
- Provides tools for capturing and then displaying SIP traffic in a graphical format.
- http://www.sipient.com

Tele Express XII Co.
- Provides development services to the alternative telecom operators. Besides, moved to "development & test tools" category.
- http://www.tele-express.net

CIDMage Caller ID Generator
- Software to generate SDMF, MDMF, CWCID and more Caller ID signals.
- http://codegods.net/cidmage/

IVR Software Development
- Produces TAPI compliant scriptable COM objects to quickly embed over-the-phone notification, text paging or SMS into applications.
- http://www.ivrsoft.com/ct-messenger.htm

Cool IVR
- Rapid CTI/IVR development tool for Windows XP/2000.
- http://www.coolivr.com

Stack Dynamics
- Portable Signaling System 7 (SS7) software.
- http://www.stackdynamics.com

Black Dolphin Technologies
- Software components for computer telephony integration.
- http://www.bdttel.com

ipNetfusion
- Automated telecom testing products.
- http://www.ipnetfusion.com

Xentec
- Create and convert audio and voice files for computer telephony.
- http://www.xentec.be/

Micro Seven
- Mini-PBX simulators.
- http://www.microseveninc.com

Calltrol
- Object Telephony Server (OTS) platform for integrating telephony support into other applications.
- http://www.calltrol.com