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1¡¢ LTE ÓïÒôÒµÎñ×îÖÕ½â¾ö·½°¸£¨B£©¡£ A.CSFB B.VOLTE C.SvLTE

3¡¢VoLTE Ö÷ÒªÊÇÒýÈ루C£©À´Ìṩ¸ßÖÊÁ¿µÄ£¨ÓïÒô£©·Ö×éÓò³ÐÔØ¡£ A.MME B.SGSN C.IMS D. EPC

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