题目内容

中央政法委于2011年8月11日发出通知，号召全国政法系统开展向（）同志学习活动。

A. 曹德旺
B. 詹红荔
C. 李林森
D. 杨善洲

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Which statement is true about the distributed call control in a VoIP network？（）

A. the VoIP endpoints have the intelligence to set up and control calls
B. Call setup and control functionality is centralized in one call agent or cluster
Call setup and control resides in call agents that are distributed throughout the network
D. Each VoIP device has separate call control， voice packetization， and transport mechanism

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