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.
除了最初设置，呼叫流程中间不需要人为操作，实现起来十分方便；
The method hsa no artificial operation in the calling flow except the first setting with convenient realization;
他们聚在带锁的柜子前交谈，呼叫着，讨论下午的安排。山姆从他们中间闪过，没有人留意到他。
They gather in front of lockers to talk, they shout and make plans for the afternoon.
他们聚在带锁的柜子前交谈，呼叫着，讨论下午的安排。山姆从他们中间闪过，没有人留意到他。
They gather in front of lockers to talk, they shout and make plans for the afternoon.
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