单选题Which statement describes the distributed call control model in VoIP networks？（）AThe gateway voice-capable device is configured to support call control directly performing call setup， call maintenance， and call teardownBThe gateway voice-capable device has a local call routing table configured through a routing protocol.CThe gateway voice-capable device relies on a call agent to support call control.DThe gateway voice-capable device relies on a gatekeeper to support call setup， call maintenance， and call teardown.
单选题
Which statement describes the distributed call control model in VoIP networks？（）
A
The gateway voice-capable device is configured to support call control directly performing call setup， call maintenance， and call teardown
B
The gateway voice-capable device has a local call routing table configured through a routing protocol.
C
The gateway voice-capable device relies on a call agent to support call control.
D
The gateway voice-capable device relies on a gatekeeper to support call setup， call maintenance， and call teardown.
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