呼叫保持补充业务能允许一个用户中断一个已经存在的呼叫的通信，随后在要求时仍可重建通信。

The call HOLD (HOLD) supplementary service, allows a user to interrupt communications on an existing call and then subsequently, if desired, re-establish communications.

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呼叫保持补充业务能允许一个用户中断一个已经存在的呼叫的通信，随后在要求时仍可重建通信。

The call HOLD (HOLD) supplementary service, allows a user to interrupt communications on an existing call and then subsequently, if desired, re-establish communications.

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