IP phone functions

IP phone function in the machine, after the input IP card within call long-distance without dial number, passwords, etc, IP need only directly dial long-distance number, such as in telecommunication bureau line as use long distance. IP card for China telecom, China unicom, China netcom, etc 17908 IP card (such as 17910, 201, 17900, etc), and to the calling card number and password without service class (such as 17909 until), applicability, use convenient, can save more long-distance call charges.

We usually telephone exchange is divided into: circuit-switched and packet switching. The traditional telecom network is circuit switching, each phone really distribution a call. The lines used in a64k Packet switching is both pack exchange group tied different data packets, respectively by a different route to the destination, and then unpack. Packet switching occupy 8K bandwidth, and circuit-switched takes up the line, so a64k save bandwidth and cost. We usually use IP telephony is packet switching, is a different from the traditional network before switching methods of telecommunications. Some switches doesn't support IP phone functions, only packet switching to support IP phone. Switches as long as there are IP phone functions can achieve with CTI (Computer Telephony functions and Computer phone the telephone, Computer is integrated into a network.