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MA5620G在NGN组网中作为MG（Media Gateway）使用。MA5620G在MGC（Media Gateway Controller）的控制下，实现VoIP业务。
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下列关于MGC(Media Gateway Controller)的功能描述那个(些)是正确的()。
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It can merely extend transport media's length so that compensate for the attenuation of signals．It isA．repeaterB．bridgeC．routerD．gateway
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在通信专业中，MAC的英文全称是（）。A、Media Access ControlB、Media Access ConnectC、Multiple Access ControlD、Multiple Access Connect
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What gateway port type can analog phones be connected to for use on a VoIP network？（）A、FXSB、FSOC、EMD、auxiliary portE、802.3af ethernetports
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Which functionality in the Cisco IOS software will enable a router to permanently act as a call agent for phones？ （）A、Cisco CallManagerB、Cisco CallManger Express （CME）C、Cisco CallManager Gateway （CMG）D、Cisco CallManager Voice Gateway （CMVG）E、Media Gateway Control Protocol （MGCP）
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In a VoIP network， which three call signaling protocols are supported by the Cisco CallManager for call setup， call maintenance， and call teardown？ （）A、 H·323B、 UDPC、 RTPD、 TCPE、 Media Gateway Control Protocol （MGCP）F、 session initiation protocol （SIP）
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Which statement describes the distributed call control model in VoIP networks？（）A、The gateway voice-capable device is configured to support call control directly performing call setup， call maintenance， and call teardownB、The gateway voice-capable device has a local call routing table configured through a routing protocol.C、The gateway voice-capable device relies on a call agent to support call control.D、The gateway voice-capable device relies on a gatekeeper to support call setup， call maintenance， and call teardown.
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Acme Company has offices around the country. With the use of Cisco Unified CallManager， the company has deployed a VoIP network in a multisite centralized configuration. Which IOS gateway feature should be deployed to enable VoIP devices to register with a local gateway and continue to function when the connection to the Cisco Unified CallManager is broken？ （）A、gatekeeper multizoneB、Call Admission Control （CAC）C、Automatic Alternate Routing （AAR）D、Survivable Remote Site Telephony （SRST）
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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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单选题Which statement describes the distributed call control model in VoIP networks？（）A
The gateway voice-capable device is configured to support call control directly performing call setup， call maintenance， and call teardownB
The gateway voice-capable device has a local call routing table configured through a routing protocol.C
The gateway voice-capable device relies on a call agent to support call control.D
The gateway voice-capable device relies on a gatekeeper to support call setup， call maintenance， and call teardown.
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