- The
Intelligent Network (IN) is a public switched telephone network architecture
developed by Bellcore (now Telcordia) and ITU-T. It
was created to provide a variety of advanced telephony services such as
800-number translation, local number portability, call forwarding, call
screening, and wireless integration. The IN uses the SS7 signaling protocol (a
worldwide telephony standard) in which voice or modem data travels through
circuit-switched voice switches, while control signals travel over an SS7
packet-switched network. INAP (Intelligent Network Application Part) is an IN
protocol used in an SS7 network to query databases for a variety of functions
not related to call setup and tear-down. INAP uses ASN.1 for defining message
content.
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- The
Integrated Services Digital Network (ISDN) and all supplementary telephone
services such as reverse charging, closed user groups, and international calling
card verification, use ASN.1 and BER.
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- ASN.1
and BER are used in routing 800-number telephone calls.
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- Each
call placed on a cellular telephone in North America, Europe, Japan and
elsewhere results in the exchange of TCAP protocol messages, which are specified
using ASN.1 and encoded using the Basic Encoding Rules (BER) of ASN.1.
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- The
Computer Supported Telecommunications Applications (CSTA) standards specify the
structure of the messages exchanged between equipment and computing applications
in ASN.1 using BER.
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