单选题What best describes an FXO interface？（）Aanalog trunks that provide the Survivable Remote Site Telephony (SRST) feature Banalog trunks that provide VoIP gateway functionality Canalog trunks that connect a gateway to plain old telephone service (POTS) device such as analog phones, fax machines, and legacy voice-mail systems Danalog trunks that connect a gateway to a central office (CO) or private branch exchange (PBX)
单选题
What best describes an FXO interface？（）
A
analog trunks that provide the Survivable Remote Site Telephony (SRST) feature
B
analog trunks that provide VoIP gateway functionality
C
analog trunks that connect a gateway to plain old telephone service (POTS) device such as analog phones, fax machines, and legacy voice-mail systems
D
analog trunks that connect a gateway to a central office (CO) or private branch exchange (PBX)
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