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 user agent client (UAC) is formally defined in SIP as an endpoint that can create and manage SIP sessions.
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)。
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.
使用服务器作为每个客户机事务的代理意味着大量用户可能导致过度的服务器负载。
Using the server as a proxy for every client transaction means that a large number of users could cause undue server load.
此外，管理员必须在LotusDominoAdministrator客户机中启用FullAdminMode，然后可以打开用户的邮件文件并启用Outof Office代理或服务。
In addition, the administrator must enable the Full admin Mode in the Lotus Domino administrator client, after which he can open the user's mail file and enable the Out of Office agent or service.
管理接口使用户能够查询给定的微代理实例及其连接的客户机的各个方面。
The administrative interface enables users to query various aspects of a given micro broker instance and its connected clients.
瘦客户机用户通过与连接代理通信获得对适当的桌面操作系统的访问(见图2)。
The thin client user contacts the connection broker to obtain access to the appropriate desktop operating system (see figure 2).
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。
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.
因此，版本5 编辑者权限级别的用户无法激活代理，而DominoDesigner 5.0.x也无法用图形区分用Notes 6.x客户机所启用的代理的状态。
Therefore, Release 5 Editor level users cannot activate agents, nor can Domino Designer 5.0.x graphically differentiate the status of agents enabled with the Notes 6.x client.
因此，版本5 编辑者权限级别的用户无法激活代理，而DominoDesigner 5.0.x也无法用图形区分用Notes 6.x客户机所启用的代理的状态。
Therefore, Release 5 Editor level users cannot activate agents, nor can Domino Designer 5.0.x graphically differentiate the status of agents enabled with the Notes 6.x client.
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