A Customer Tells You That the IP Office VoIP System

A customer tells you that the IP Office VoIP system has too much lag time between the speaker and the listener. Which two statements describe what you should do to determine the cause of the delay? (Choose two.)

A) Use SSA.
B) Examine the IP Telephone VoIP settings.
C) Check the PSTN Connection
D) Enable RTCP monitoring.
E) Use debug view.