ISO/IEC 15051:2003
Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Specification, functional model and information flows -- Recall supplementary service
发布时间：2003-03-21 实施时间：


私有综合服务网络（PISN）是一种专用的电信网络，用于在企业内部或组织内部提供通信服务。PISN可以提供多种服务，如电话、传真、数据传输等。为了更好地满足用户的需求，PISN还可以提供一些补充服务，如召回补充服务。

召回补充服务是一种PISN提供的服务，它允许用户在通话过程中将另一个用户添加到通话中，或者将通话转移到另一个用户。这种服务可以提高通信的效率和灵活性，特别是在需要多人协作的情况下。

ISO/IEC 15051:2003标准规定了召回补充服务的功能模型和信息流。该标准定义了召回补充服务的各种操作和消息，包括召回请求、召回确认、召回拒绝、召回完成等。这些操作和消息可以在PISN中进行交换，以实现召回补充服务。

ISO/IEC 15051:2003标准还规定了召回补充服务的一些额外要求，包括：

1. 召回补充服务应该支持多种通信方式，如语音、传真、数据传输等。

2. 召回补充服务应该支持多种呼叫类型，如内部呼叫、外部呼叫、转移呼叫等。

3. 召回补充服务应该支持多种呼叫状态，如呼叫中、保持、转移等。

4. 召回补充服务应该支持多种呼叫方向，如单向呼叫、双向呼叫等。

5. 召回补充服务应该支持多种呼叫控制方式，如手动控制、自动控制等。

ISO/IEC 15051:2003标准的实施可以提高PISN的通信效率和灵活性，为用户提供更好的通信服务。

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-related supplementary services -- 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-related supplementary services -- 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-related supplementary services -- 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-related supplementary services -- Part 4: Protocol Implementation eXtra Information for Testing (PIXIT) for the supplementary services of call transfer and call deflection

ISO/IEC 11579-5:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call-related supplementary services -- Part 5: Protocol Implementation eXtra Information for Testing (PIXIT) for the supplementary services of call waiting and call hold