User:Fritomd/Books/BTS


 * Public switched telephone network
 * Unified communications
 * Business telephone system
 * Session Initiation Protocol
 * Integrated Services Digital Network
 * Voice over IP
 * Dial plan
 * Direct inward dial
 * IP PBX
 * Competitive local exchange carrier
 * Internet Protocol
 * Plain old telephone service
 * Basic Rate Interface
 * Router (computing)