TheNeilsonFarmhastried,withoutsuccess,tousebothCiscofaxrelayandT.38faxingserviceswithCiscoUnifiedCallManagerExpress.Theonlyfaxingservicethatseemstoworkisfaxpass-through.Whichporttypeisconnectedtotheirfaxdevice?（）A.FXOB.FXSC.ATAD.FAXE.E&M
题目
TheNeilsonFarmhastried,withoutsuccess,tousebothCiscofaxrelayandT.38faxingserviceswithCiscoUnifiedCallManagerExpress.Theonlyfaxingservicethatseemstoworkisfaxpass-through.Whichporttypeisconnectedtotheirfaxdevice?（）
A.FXO
B.FXS
C.ATA
D.FAX
E.E&M