背靠背用户代理(Back-to-Back User Agent):背靠背用户代理(B2BUA)是一个逻辑实体,作为一个UAS接收请求并处理.为了决定怎样应答请求,B2BUA会作为一个UAC来产生请求.
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要实现这些操作，需要有一个应用程序在呼叫的中间位置充当背靠背的用户代理，并提供对上述服务的访问。
To make these actions happen, you need an application to sit in the middle of the call, act as a back-to-back user agent, and provide access to the services mentioned.
在这种应用程序中，SIP Servlet将充当代理或背靠背的用户代理(B2BUA)。
In this type of application, the SIP servlet will act either as a proxy or a back-to-back user agent (B2BUA). Whether this is a proxy or B2BUA influences the capabilities of the SIP service.
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