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下一代网络在业务层面上的一个显著特点和优势是业务提供能力的开放性。针对业务开放能力的要求，各个电信研究机构和组织都进行了广泛的研究，其中获得业界广泛支持的是3GPP 和 Parlay 研究组提出的 Parlay 协议规范，该规范采用 API 的方式将电信网络的业务提供能力描述，从而提供了 IT开发人员进行电信业务开发的能力。Parlay 协议规范也称为 OSA API。
One of the notable features and benefits of NGN at the business level is the openness of business capabilities. In response to the demand for business openness, various telecommunication research institutes and organizations have conducted extensive research. Among them, widely supported by the industry is the Parlay protocol specification proposed by the 3GPP and Parlay research groups, which uses the API to provide the service of the telecommunication network Capability Description, which provides IT developers the ability to develop telecommunications services. The Parlay protocol specification is also known as the OSA API.