单选题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 ControlB TAPIC MGCPD SRST
单选题
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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