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多項(xiàng)選擇題

What two are features of the Cisco Unified CallManager Express QCT?()

A.autodetection of Cisco router components 
B.automatic download of system parameters from central site 
C.standards-based autoconfiguration using SIP and SCCP 
D.support for barcode-scanned input of IP-phone MAC addresses and phone types 
E.automatic identification of phone types and MAC addresses upon booting the Cisco Unified CallManager Express router

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