- CopperCom
 - Designs, develops, and markets a new class of DSL technology that lets phone companies deliver high-speed data and multiple telephone lines simultaneously over a single, conventional copper wire pair. - Cyberpath Inc.
- Offers a voice-over DSL gateway solution for both customer premises and central office, allowing for bundled voice and data services.
- General Bandwidth, Inc.
- Enables toll-quality voice services to residential and business customers across broadband access networks such as digital subscriber line (DSL), cable, and wireless.
- Jetstream Communications
- Designs, develops, and sells voice over broadband access solutions to local communications networks.
- Lea
- Manufactures active and passive splitters for simultaneous use of high speed DSL and standard telephone services. For DSL, ADSL, and xDSL technologies.
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