私有综合服务网络（PISN）是一种专门为企业或组织内部提供通信服务的网络。PISN可以提供多种通信服务，如语音通话、传真、数据传输等。呼叫干扰补充服务是PISN中的一种补充服务，它可以让第三方插入自己的话语，从而实现多方通话的功能。

ISO/IEC 14846:2003标准规定了呼叫干扰补充服务的功能、信令协议、消息格式和交互过程。该标准定义了以下几个方面：

1. 呼叫干扰补充服务的功能：呼叫干扰补充服务可以让第三方插入自己的话语，从而实现多方通话的功能。该服务可以在通话过程中启用或禁用。

2. 信令协议：呼叫干扰补充服务的信令协议采用了ITU-T Q.931协议。该协议定义了呼叫干扰补充服务的消息格式和交互过程。

3. 消息格式：呼叫干扰补充服务的消息格式包括呼叫干扰请求消息、呼叫干扰确认消息、呼叫干扰拒绝消息、呼叫干扰解除消息等。

4. 交互过程：呼叫干扰补充服务的交互过程包括呼叫干扰请求、呼叫干扰确认、呼叫干扰拒绝、呼叫干扰解除等步骤。

ISO/IEC 14846:2003标准的实现可以提高PISN的通信效率和灵活性，使得企业或组织内部的通信更加便捷和高效。

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 11579-3:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call Transfer supplementary service -- Part 3: Protocol implementation extra information for testing (PIXIT)

ISO/IEC 11579-4:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call Transfer supplementary service -- Part 4: Test suite structure and test purposes

ISO/IEC 11579-5:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call Transfer supplementary service -- Part 5: Abstract test suite