多选题Which two Internet Protocol (IP) telephony devices are best categorized as infrastructure components? （）AIP telephonesBVoice gatewaysCCall management softwareDMedia Convergence Servers (MCSs)
多选题
Which two Internet Protocol (IP) telephony devices are best categorized as infrastructure components? （）
A
IP telephones
B
Voice gateways
C
Call management software
D
Media Convergence Servers (MCSs)
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