Thodukonics
- Provides wireless, household, domestic, wall, line and grid and AC power intercom.
- http://www.kochismartciti.com

Aiphone
- Manufacturer of intercom and entry security products.
- http://www.aiphone.com/home.htm

Videx Door Entry and Access Control
- Designs and manufactures audio and video security entry systems, door entry intercoms and access control systems.
- http://www.videx-security.com/

Lee Dan Communications, Inc.
- Provides an online catalog of offered intercoms and postal products.
- http://www.leedan.com/

Housing Devices Inc.
- Manufacturer of vandalproof building entry intercoms, apartment audio/video intercoms and emergency call systems.
- http://www.housingdevices.com/

Grupa Techniczna CODI
- Manufacturer of digital door phones, video door phones, and intercoms. Poland.
- http://www.codi.pl/

Golrmar
- Spanish manufacturer and exporter of audio and video door entry systems, intercoms, monitors, and door releases.
- http://www.golmar.es/

Alpha Intercom
- Offers intercoms, video-intercoms, access controls, door strikes, and nurse call systems. Based in Canada.
- http://www.alphaintercom.com/

Aiphone Corporation
- Manufacturer of intercom solutions for communication and security, providing a wide variety of audio and video systems, specializing access entry and control systems in the world.
- http://www.aiphone.com/