IP: Internet Protocol
IP-PBX: short for Internet Protocol - Private Branch eXchange is VoIP based telephone exchange used by companies. In business telephone systems, IP-PBX can be purchased or hosted by VoIP providers, unlike traditional PBX provided by CLEC/ILEC carriers.
IP telephony: a technology that allows you to make and receive telephone calls within LAN. See VoIP.
ISDN: short for Integrated Services Digital Network.
ISP: Internet Service Provider
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