企业通信网络是指在企业内部建立的通信网络，用于实现企业内部的通信和协作。QSIG和H.323是两种常用的企业通信网络协议，它们分别用于传输语音和数据。在企业通信网络中，呼叫转移是一项非常重要的功能，它可以将来电转移到其他电话或语音信箱，以便用户不会错过任何重要的电话。

ISO/IEC 21411:2001标准规定了QSIG和H.323之间的信令交互，以实现呼叫转移功能。该标准定义了QSIG和H.323之间的信令协议，包括呼叫转移请求、呼叫转移确认、呼叫转移取消等。该标准还规定了QSIG和H.323之间的信令传输方式，包括基于TCP/IP的信令传输和基于ISDN的信令传输。

该标准的实现可以使企业通信网络中使用QSIG和H.323协议的呼叫转移服务更加灵活和高效。通过QSIG和H.323之间的信令互通，用户可以在不同的终端设备之间无缝切换呼叫转移服务，从而提高了企业通信网络的可用性和可靠性。

相关标准
- ISO/IEC 11579-1:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call transfer supplementary service -- Part 1: Protocol specification
- ISO/IEC 11579-2:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call transfer supplementary service -- Part 2: Protocol implementation conformance statement (PICS) proforma
- ISO/IEC 13870:1998 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call transfer supplementary service using DSS1
- ISO/IEC 13871:1998 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call transfer supplementary service using QSIG
- ISO/IEC 14721:1999 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call transfer supplementary service using H.450.2