呼叫类型可以分为语音呼叫（Voice call）,数据呼叫（data call）,传真呼叫（ 上海的传真号怎么在重庆接收上海的传真机上设置无条件呼叫转移到重庆的传真机号码！
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目前，ISUP业务还只是针对语音和数据呼叫。
Presently, ISUP services are associated only with voice and data calls.
绝大多数语音呼叫和数据呼叫都在交换电路上承载。
The vast majority of voice calls and data calls are carried over switched circuits.
采用本发明所述的方法及装置，可以提高语音并发数据呼叫的成功率，方便用户的使用。
The method and the device can improve the success rate of calling the speech concurrent data and are convenient for users to use.
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