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综合业务数字网（ＩＳＤＮ）是未来通信网发展的趋势。本文介绍了一种在ＩＳＤＮ网上应用较为广泛的电信业务──ＩＳＤＮ可视电话业务与ＩＳＤＮ网或公共电话网（ＰＳＴＮ）上其它电话业务互通所需采用的一种信令协议。
Integrated Services Digital Network (ISDN) is the development trend of the future communications network. This article describes a signaling protocol that is required for a wide range of telecommunication services on the ISDN network—an ISDN videophone service to interoperate with other telephone services on the ISDN network or the public telephone network (PSTN).