Private branch exchange/Related Articles
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- Convergence of communications : Technical specifications and infrastructure to allow all types of communications (e.g., telephone, web, television) to interface over a common set of information transfer technologies
- Pentagon Building : Headquarters office building of the U.S. Department of Defense, as well as a symbol of the U.S. military
- TRI-TAC : An obsolescent U.S. military tactical communications architecture of the 1980s, providing analog and digital telephone and low-speed data services
- Voice over Internet Protocol : A family of standards that permits carrying voice telephony over Internet Protocol networks that handle both voice and data, instead of dedicated telephony networks.