English to Chinese Tech/Engineering IT (Information Technology)

In an all-IP telephony system, there is no PBX. It’s replaced completely by a telephony server that handles all the calls, both internally and externally. Cisco Systems , 3Com, and a raft of smaller companies offer such pure-play IP telephony servers. (Some are designed for small businesses, whereas others are for large enterprises.) They also offer typical PBX features such as internal directories and voice mail, but they usually also allow you to integrate faxes, calendars, and address books, because these are all available over the network.