A user using a CP-9971 SIP phone reports that during a video call, the video portion of the call freezes. What should you do in order to point to and troubleshoot the issue?

A user using a CP-9971 SIP phone reports that during a video call, the video portion of the call freezes. What should you do in order to point to and troubleshoot the issue?
A . Restart the phone.
B . On the phone, navigate to Administrator Settings > Status > Call Statistics > Video > Video statistics > Rcvr Packets statistics. Verify if the phone is receiving packets.
C . Make sure that the camera is connected to the US
E . Verify if the camera shutter is open.
F . Perform a factory reset of the phone.

Answer: B