call forwarding on busy

常見例句

雙語例句

• Finally, taking Call Forwarding on Busy Service as an example, it illuminates the process type and function description of SIP protocol mapping.
  最後以呼叫前轉(zhuǎn)業(yè)務(wù)爲(wèi)例， 給出了組成SIP協(xié)議映射的進(jìn)程類型和功能描述。
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