单选题Which statements is true about Foreign Exchange Station （FXS） ports on a router？（）Athe FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central officeBthe FXS interface connect directly to a standard telephone， fax machine， or sililar device and supplies ring， voltage， and dial toneCthe FXS interface connect directly to an IP phone and supplies ring， voltage， and dial toneDthe FXS interface connect directly to ISDN voice channels
单选题
Which statements is true about Foreign Exchange Station （FXS） ports on a router？（）
A
the FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central office
B
the FXS interface connect directly to a standard telephone， fax machine， or sililar device and supplies ring， voltage， and dial tone
C
the FXS interface connect directly to an IP phone and supplies ring， voltage， and dial tone
D
the FXS interface connect directly to ISDN voice channels
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