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Which two Internet Protocol (IP) telephony devices are best categorized as infrastructurecomponents?（）
- A、Call management software
- B、Media Convergence Servers (MCSs)
- C、Voice gateways
- D、IP telephones
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Which two Internet Protocol (IP) telephony devices are best categorized as infrastructure components? （）A、IP telephonesB、Voice gatewaysC、Call management softwareD、Media Convergence Servers (MCSs)
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