Unlike a proxy that forwards on the requests, a B2BUA acts as both a user agent server (UAS) and a user agent client (UAC) to further participate in the SIP transaction.
与转发请求的代理不同，B2BUA 同时充当进一步参与SIP 事务的用户代理服务器 (UAS)和用户代理客户机 (UAC)。
A user agent client (UAC) is formally defined in SIP as an endpoint that can create and manage SIP sessions.
用户代理客户机(user Agent Client,UAC)在SIP中被正式定义为能创建和管理SIP会话的端点。
A third option, rather than using client side XSLT, is to detect the user agent at the server and to provide different content depending on the user agent's capabilities.
除了使用客户端XSLT之外，还有第三种选择，那就是在服务器检测用户代理，并根据用户代理的功能提供不同的内容。
When a user visits a portal application through a KIOSK, the client shown to the portal server is determined by the user agent.
当用户通过KIOSK访问门户应用程序时，客户端显示给门户服务器的信息由用户代理决定。
A user agent, such as the browser, understands how to handle these scenarios; however, a typical client who is using Ajax as the requesting mechanism won't understand.
一个用户代理，比如浏览器，知道该如何处理这些场景；但是典型的使用Ajax作为请求机制的客户机并不知道。
The specific client is determined by the User-Agent field in the HTTP request headers.
具体的客户机由HTTP请求头中的User - Agent字段确定。
The specific client is determined by the User-Agent field in the HTTP request headers.
具体的客户机由HTTP请求头中的User - Agent字段确定。
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