Opening the networks with Parlay/OSA: standards and aspects behind the APIs

Recently there has been an enormous increase in efforts to open up telecommunication networks for application development. In opening up the network, new business models emerge where applications can be developed and provided by enterprises outside the traditional network operator domain. This new business model, combined with the fact that applications can be built using standardized API with off-the-shelf IT technology and tools, will result in new innovative applications that will hit the market with drastically reduced development cycles. This article provides an overview of the Parlay/OSA initiatives concerning the specification of a set of open standardized API. Furthermore, the article outlines some architectural aspects that are implied and implicitly contained in the Parlay/OSA specifications. These are critical for understanding the implications when allowing access to the network via Parlay/OSA. The article then outlines different types of applications that can be built using Parlay/OSA. Finally, we conclude with an analysis of the future of Parlay/OSA.     

The Application of WSFL in the Parlay X Based Services Creation

1　Introduction　NGN abstracts beneath protocols as a set of easy under standing interfaces through open Application ProgrammingInterfaces (API). These APIs are independent with net works, so the services created with these APIs are irrespec tive to special network details[1]　ParlayXAPI is a set of more single and higher abstractedAPIs than Parlay API. These ParlayXAPIs have the abilityto access the network functions, and are easy to understandby IT developers to use in …     

下一代网络开放业务接口的研究

下一代网络是基于业务驱动的网络,开放性是下一代网络的重要特征。在分析研究一些典型的开放接口技术基础上,针对Parlay X业务呼叫接口存在的缺陷,提出Parlay X增强型业务呼叫接口的改进方案,并给出其实现模型。通过使用增强型呼叫接口,应用开发商不需要掌握详细的电信知识,就能对呼叫进行持续并且有效的监控,并且以更为灵活的交互方式为用户提供丰富多彩的特殊资源。     

基于Parlay X的下一代电信增值业务模型研究

Parlay X是一套简单易懂、比之Parlay在更高层次抽象电信网络基本功能的应用编程接口(API),它以Web Service的形式供IT应用开发者在开发的应用中调用电信网络功能.下一代网络业务的发展是一个渐进过程,对运营商来说,如何以更小的成本快速开发和部署新业务成了当务之急.文中介绍了Parlay X体系结构模型,着重提出了基于Parlay X的电信增值业务过渡模型,并对短信业务的开发流程进行了分析.     

Developing applications for Internet telephony: a case study on the use of parlay call control APIs in SIP networks

Applications offered to end users as value-added services, or more simple, services, are crucial for the survival and success of service providers. Two main sets of standards have emerged for Internet telephony: H.323 from the ITU-T and SIP from the IETF. Unfortunately, the related application development frameworks are rather weak. Parlay, a set of standard object-oriented and signaling protocol-neural APIs, is an alternative. It allows applications to access network functionality, including call control, in a controller manner. Call control makes it possible to establish, modify, and tear down calls. It is the main functionality offered by Internet telephony networks. We have built a call control application in a SIP environment, using the call control APIs offered by Parlay. The application is a multiparty game. This article describes the case study. The mapping of the APIs onto SIP is presented, and its implementation is described. Related work reviewed, and the lessons learned are discussed. Parlay call control APIs are suitable for application development in Internet telephony. However, well isolated extensions are needed to realize their full potential.     

基于开放业务的网络融合

文章以IP电话为应用背景论述了网络融合的两种典型模型,讨论了采用Parlay/OSA 4.0开放业务规范实现网络融合的可能性,提出了一种能提供跨越因特网与传统电话网之间IP电话业务的网络融合方案:一种基于开放业务的网络融合方案,并讲座了该方案在实现网络融合相关的电信业务方面的优点和不足.     

Policy-based Softswitch System Management

1　Introduction　InthecurrentInternetarea ,managementsystemsaredevelopedmainlybasedontheInternetStandardManagementFrameworkSNMP[1 ] toimplementnetworkelementmanagement.WhilethiskindoftraditionalSNMP basednetworkmanagementmakespossibleadevice by deviceconfigurationofnetworkelements,theincreasedsizeandcomplexityturnstheconfigurationintoamoredifficulttask .Theincreaseinsizemeansmoredevicesneededtoconfigure ,andtheincreaseincomplexitymeansthatdevicesareofdifferenttypesandfromdifferentven dors…     

Parlay X技术在移动增值业务开发中的应用研究

简要介绍了Parlay X产生的背景以及与Parlay API的关系、接口功能,举例说明了Parlay X技术在移动增值业务开发中的实际应用,并从开放服务、完善能力、接口细化等方面提出了需要进一步完善的建议。     

智能网开放业务接口的研究

阐述了在新的形势下开放智能网业务接口的必要性以及智能网开放技术的现状和目前存在的局限性,提出了智能网开放业务接口的技术解决方案.该解决方案在Parlay架构的基础上提出了构建Parlay X网关,并阐述了此网关的系统结构、功能实体以及各功能实体与智能网的关系;同时还阐述了Parlay X网关为应用服务器提供的Parl ay X接口封装以及网关通过Parlay X到底层协议的映射实现对底层网络的操作,由此进一步阐明了该解决方案.     

Screen-based telephony

Experimentation with screen-based telephony is discussed in the framework of Apple Computer's user-centered design philosophy. The approach described enables programs to be developed for the most ubiquitous technologies today-plain old telephone service (POTS) and proprietary private branch exchanges (PBXs)-but also allows for an easy, logical upgrade to future technologies like ISDN. The model has been built in three layers, which reflect the three constituencies who must cooperate to bring ISDN applications (and their forerunners) to market, in the volume required to spark the growth of this area: telecommunications vendors, personal computer vendors, and independent software developers. The Call Manager Application Programmers Interface is the code/specification from Apple that enables voice and data applications to be written independently of the vendor or technology. Telecommunications vendors can write drivers to the Application Program Interface (API) and build the appropriate hardware interfaces, without having to support thousands of software developers. Some of the features of Apple's prototype human interface to the voice network on this API are described     

电信业务能力开放技术标准

电信业务能力的开放是电信技术发展过程中长期研究的热门课题之一,电信业务能力的开放技术在不断的发展,相应的标准也在不断的提出或更新。在这些标准规范之中,JCP和Parlay系列规范是两大主流的国际规范,分别提供了不同层次的、面向不同用户对象的业务能力开放技术标准。其中,JCP针对JAVA应用开发人员制定了JSR21、JSR32、JSR116和JSR289等系列规范,而Parlay则提出了Parlay和Parlay X等规范,规范的版本也在不断地更新之中。各种不同的能力开发技术实现方法不同,各有各的优势和生命力。随着业务开发的群体不断壮大和融合业务开发的要求越来越明显,提供一种快速、高效和简易的业务能力开放技术就成为业务能力开放技术研究的重点。     

Web服务及其在Parlay接口中的应用

电信网与Internet走向融合，而Parlay接口与Web服务作为各自领域开放技术的代表，也开始了互相结合。Web服务是一种基于可扩展标记语言（XML）、面向消息的分布式计算技术，与公共对象请求代理体系结构（CORBA）等分布式对象技术相比，在Internet范围内的互操作性更好。Web服务是实现面向服务体系结构（SOA）的最佳候选技术之一。基于Web服务的Parlay接口包括Parlay Web服务和Parlay X。其中，Parlay Web服务模拟面向对象的Parlay应用编程接口（API）定义，Parlay X的设计遵循Web服务面向消息的技术发展思路。基于Web服务的Parlay接口技术为构建电信网和Internet融合环境下的统一业务体系提供了基础。     

Evolutionary trends in intelligent networks

A number of groups are currently developing technologies aimed at evolving and enhancing the capabilities of intelligent networks. In this article we discuss three of these initiatives: PINT, Parlay, and IN/CORBA interworking. The IETF PINT work addresses how Internet applications can request and enrich telecommunications services. The Parlay consortium is specifying an object-oriented service control API that facilitates the access, control, and configuration of IN services by enterprise IT systems. The OMG's IN/CORBA interworking specification enables CORBA-based systems to interwork with existing IN infrastructure, thereby promoting the adoption of CORBA for the realization of IN functional entities. We address how all three of these technologies could be deployed together in order to provide a basis for a more flexible and open IN architecture. We also identify a number of common trends and potential pitfalls highlighted by current work on the evolution of IN     

基于Parlay X Web Service开发多方多媒体会议业务的研究

本文首先概述了Parlay X Web Service的概念及其优点,接着详细介绍了按照Parlay X Web Sewice2.0规范开发多方多媒体会议的方案,最后分析了在会议中增加语音交互能力时需要解决的技术问题,并给出了解决方法.     

An introduction to TSAPI and network telephony

Discusses the integration of the telephone into the desktop work environment. This objective can be achieved in a number of different ways. The approach described uses the client-server model. Network telephony is a service that provides the capability to establish, answer, route, and terminate telephone calls under the control of applications on either desktop computers or servers resident in the network. It is accessed by applications via a standard programming interface (telephony services application programming interface, TSAPI) and utilizes a centralized server-based interface with the private branch exchange (PBX) to access the switching and telephone control services that the PBX provides. Creating a logical control link between the application software on the desktop computer and the telephone on the desk eliminates the need to physically connect the telephone to the desktop computer. The author distinguishes between the application programming interface and the network telephony service provider. The author assumes the services are provided by NTS R2.2 release and a PBX-based switching service. However, the author uses the term PBX to include switching services provided by key telephone or hybrid systems, PC-based telephony cards, or other appropriate technologies     

X.25 Interface and End-to-End Virtual Circuit Service Characteristics

Public packet switching networks around the world use CCITT Recommendation X.25, which is the standard device-independent interface between packet networks and user devices operating in the packet-mode. Since its development in 1976 and with four years of network operational experience, the X.25 interface specification has reached a high level of maturity. A revised version of X.25 has been approved by CCITT Study Group VII at its meeting in February 1980. The revised X.25 specification is more complete than its predecessor, eliminates a number of ambiguous areas which lead to network implementation differences, and has been enhanced by the addition of new capabilities both to the X.25 interface and to the end-to-end service. This paper presents a consolidated view of the end-to-end characteristics of the virtual-circuit-based services accessible through the X.25 interface. It then discusses the characteristics of the revised X.25 interface, with emphasis on areas that have been addressed in the revised Recommendation. The revised Recommendation leads the way to greater commonality among network implementations. The increased functionality of the end-to-end virtual-circuit services has impact on the relationship of X.25 to system architectures being discussed by international standards bodies.     

ISDN computer-aided telephony

It is argued that ISDN computer-aided telephony requires properly architected platforms to satisfy changing application needs during the 1990s. Proper architecting necessitates the use of functionally rich and consistent telephony application programming interfaces (APIs). Other APIs are also needed to support integrated applications. The coexistence of telephony and other APIs must be accommodated in the ISDN driver architecture to make efficient use of D-channel signaling and voice, data, or image communications on the associated B/H channels. This driver may support Open Systems Interconnection (OSI), Systems Network Architecture (SNA), X.25, or other protocol stacks in the same computer using a single ISDN access link. Applications being currently explored show that significant benefits can be realized using incoming call management and LAN-based image server access by means of ISDN. It is envisioned that by the year 2001, a common API will facilitate multimedia applications on multivendor platforms architected within the OSI framework. These platforms will support interconnections of public and private ISDNs and bridging to BISDNs     

如何使 APP 更智能

首先描述了在移动智能终端环境下的制约因素，这些制约因素将会影响应用软件的用户体验。然后我们从用户界面的流畅性和可操作性，移动网络数据传输等方面分析了现有应用软件存在的问题，并且分别给出了指导建议。遵循以下建议，开发者们将能够创造出更智能的应用。     

Opening up networks with JAIN Parlay

The desire for new business growth has been a major driving force towards the development of open network APIs, such as the Parlay API, within telecommunications networks. The Parlay API enables both third parties (external companies, operating outside the security domain of the network operator) and network operators to build new applications that rely on real-time control of network resources. The Java APIs for integrated networks (JAIN^TM) Community is defining a Java version of the Parlay API to bring the benefits of the Java language to the Parlay API, and to promote industry-wide adoption of the Parlay API. This article describes the background and rationale behind the work of the Parlay Group, together with the characteristics, structure, and capabilities of the Parlay API. The benefits that Java and the JAIN Community bring to the Parlay API are then explored. A technical overview of the Java version of the Parlay API, referred to as the JAIN Parlay Edit Group API, is given and illustrated using example sequence diagrams. The article concludes by taking a look at what additional features may be added to the API and the implementation activities that lay ahead