Dr. Boris J. Lurie
- Offers consulting in high-performance feedback controllers: SISO and MIMO, digital and analog, for electrical and mechanical systems.
- http://www.luriecontrol.com/Consulting.htm

Linnabery Telecom and Video Services Consulting
- Telecommunications consulting firm, specializing in assisting small or start-up telecommunications or video services companies.
- http://linnabery.com/

LBA Group Inc.
- Wireless industry's one-stop shop for RF compliance, RF shielding, RF safety, RF interference, AM detuning, AM collocation and RF intermodulation studies.
- http://www.lbagroup.com

Larribeau Associates
- Market analysis and strategic product and service planning for the telecommunications networking and access industries.
- http://www.larribeau.com

L.C. Wiring, Inc
- Provide phone systems, voice mail, networking, fiber optics, cabling, wiring, phones, telephones, and networking.
- http://www.lcwiring.com/

Loxysoft AB
- Consulting focused on CTI.
- http://www.loxysoft.se/

Lightspeed Technologies
- Comprehensive portfolio for creating complete networking systems solutions.
- http://www.lightspeedtech.net/

L1 associates
- Provides independent professional services for the convergence of voice, video, and data over public and private, fixed and wireless networks.
- http://www.l1associates.com