An end user is in Cisco TelePresence session with a remote participant and can control the camera at the remote endpoint. Which feature is underlying in this scenario?

FEC (Forward Error Correction) is a mechanism for recovering lost or corrupted packets in a media stream and has no relationship to camera control.

DTMF (Dual-Tone Multi-Frequency) is used for sending keypad tones during a call, commonly for IVR navigation, not for controlling remote cameras.

FECC (Far End Camera Control) is the feature that allows a near-end endpoint to send PTZ (pan, tilt, zoom) commands to the camera at the remote endpoint during an active video call. It is typically implemented using H.281 signaling over H.323 or a similar mechanism over SIP. Both endpoints must support and have FECC enabled for the feature to function.

PIP (Picture-in-Picture) is a video layout feature that displays a smaller inset window of the local or a secondary video source and does not provide any camera movement control.