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单选题
Which VoIP components can permit or deny a call attempt on the basis of a network’s available bandwidth？（）
A
MCU
B
Application server
C
Gateway
D
Gatekeeper
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单选题Which VoIP components can permit or deny a call attempt on the basis of a network’s available bandwidth？（）A
MCUB
Application serverC
GatewayD
Gatekeeper
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