国际追加服务 International Complementary Service
追加服务通知 CSSN
改变追加服务密码 CPWD
呼叫相关的追加服务 CHLD
无组织的追加服务数据 CUSD
HTTP客户端可以用自己喜欢的数据格式和语言，在请求的头部追加目标URI来传送。内容提供者应该提供这些设置服务。
HTTP clients may pass over the preferred data formats and languages along with the target URI in the request header, and the content provider should serve these Settings.
REST通常从服务入口url开始形成一次请求，然后以查询字符串的形式追加搜索参数。
Typically, REST forms a request by beginning with a service entry URL and then appending search parameters in the form of a query string.
显式服务上下文的表现形式是作为追加于服务方法调用的附加参数。
The explicit service context is represented as additional parameters appended to the service method calls.
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