基本SHAKEN框架使SHAKEN授权VoIP服务提供商能够向终端服务提供商提供受加密保护的断言（“认证”值），该断言在指定条件下指示呼叫用户有权使用呼叫电话号码。本规范扩展了基本SHAKEN框架，使SHAKEN授权TN服务提供商能够向其非SHAKEN授权客户颁发本文件中定义的委托证书，该证书允许客户证明其拥有呼叫TN的分配或委托给非TN服务提供商的SHAKEN发起服务提供商。这是发起服务提供商确定其客户的呼叫有权获得特定企业或合法呼叫欺骗场景的完全认证的一种可能方法，其中发起服务提供商与呼叫实体和/或呼叫TN没有直接关联。

The base SHAKEN framework enables a SHAKEN-authorized VoIP Service Provider to deliver a cryptographically protected assertion (the "attestation" value) to a terminating service provider that under specified conditions indicates the calling user is authorized to use the calling telephone number. This specification extends the base SHAKEN framework to enable SHAKEN-authorized TN Service Providers to issue delegate certificates defined in this document to their non-SHAKEN-authorized customers that allows the customer to prove it possesses an assignment or delegation of a calling TN to a SHAKEN originating service provider that is not also the TN Service Provider. This is one possible method for an originating service provider to determine that its customer's call is entitled to full attestation for certain enterprise or legitimate call spoofing scenarios where the originating service provider does not have a direct association with the calling entity and/or the calling TN.