单项选择题
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)
相关考题
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多项选择题
Whataretwostepsthataretakenwhenarouterconvertsavoicesignalfromanalogtodigitalform？（）
A.sampling
B.packetization
C.quantization
D.serialization -
单项选择题
WhichstatementistrueaboutadistributedcallcontrolenvironmentandtheprocessingofdialeddigitsfromanIPphone？（）
A.The router that is directly connected to the IP phone will look up the called number in its call routing table.
B.The router that is directly connected to the IP phone will inform its call agent when a service request is detected.
C.When the IP phone is picked up，the IP phone initiates the service request.
D.The directly connected router passes the collected digits to its call agent，and the call agent looks up in its call-routing table the called number. -
多项选择题
WhataretwomajorsourcesofdelaythatcanbemanagedbyQoSinvoice-enablednetworks？（）
A.propagation delay
B.voice packet serialization delay
C.congested egress queues
D.header overhead
E.packets dropped because of CRC errors
