单项选择题

A. Call Admission ControlB. TAPIC. MGCPD. SRSTAcompanyi……

A company is using a multi-site centralized call processing model. Which feature ensures that theremote site IP phones will still have limited functionality given a WAN outage？（）

A. Call Admission Control
B. TAPI
C. MGCP
D. SRST

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