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多选题
What are two reasons to implement H·323 gatekeepers？（）
A
to eliminate the need for VoIP gateways
B
to scale a VoIP installation with multiple gateways
C
to provide call admission control and limit the number of simultaneous calls on the network
D
to meet the requirement to control H·323 gateways on a LAN
E
to accept call requests and reduce the load on the gateway
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