- Tekelec
 - Developer of telecommunications signaling solutions, packet-telephony infrastructure, network monitoring technology, and value-added applications. - TeleAdaptors
- Supplies connectivity, security, and power solutions to PC and modem manufacturers, as well as national and multi-national companies.
- Network Technologies, Inc.
- Manufactures video and KVM switches and splitters for computers, FireWire and USB hubs, and cables and adapters to extend keyboard, mouse, and VGA.
- Santera Systems, Inc.
- Provider of next-generation switching equipment including a softswitch (media gateway controller, signaling gateway and applications server) and a high-density media gateway.
- PESA Switching Systems,Inc.
- Digital Resources, Inc.
- Sells, installs, and supports store-and-forward message switching systems and networks.
- NACT Telecommunications
- Manufacturer of VoIP network gateways, switches, and telecommunication billing systems.
- Quintech Electronics and Commmunications Inc.
- Offers frequency conversion, signal switching, and routing and interface products.
 CML Technologies, Inc.
- Designer and manufacturer of state-of-the-art digital switching equipment.- Cyber Digital
- Manufacturer and software developer of digital voice switching systems for network operators.
- Matrix Systems
- Designs and manufactures a range of reed relay and solid state switching modules, matrices and switching systems.
- FaxSwitch.com
- Offers multi-link fax and modem switches to eliminate the need for extra phone lines.
- MicroLegend Telecom Systems
- Provides SS7 monitoring and control systems for network mediation, fraud control, protocol conversion, and real-time network monitoring applications.
- Oresis Communications
- Developers of a multiservice, carrier-class switch delivering integrated interworking between ATM, TDM and frame-based networks.
- Xros, Inc.
- Develops optical cross connect switches.
- Linkdata Communications
- Internet connections, integration, consulting, project management and onsite service and repair.
- TransMedia Communications Inc.
- Offering a multimedia carrier switch that has the capability to integrate a range of carrier networks, media traffic types, and transport seeds.
- Phyco, Inc.
- Computer & telecommunications components.
- Lumda Systems, Inc,
- Design, manufacture and distribution of direct-to-line, DTL multiplex, FDM, analog multiplex, T1 cable simulator, and PCM digital equipment.
- Orion Communication
- Distributor of various fibre optic connectors, splitters, patches, adapters (SC, ST, FC & LC, etc), and converters used for cable assemblies (patch cord, attenuator) of CATV, telecommunication, LAN, WAN, etc.
- Unifive Technology Co., Ltd.
- Manufacturer of AC DC adapters, switching AC adapters and power supplies, and more.
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