Refer to the exhibit. The following issues are encountered when calls are placed from Phone A to Phone B:
– If the caller on Phone B does not answer, Phone B continues to ring even if the caller on Phone A hangs up.
– If the call is answered, it stays active until the caller on Phone B hangs up, regardless of the actions of the caller on Phone A.
How can the underlying problem be resolved?

A.
Configure battery reversal on the FXO port.

B.
Turn off tone-based supervisory disconnect on the FXO port.

C.
Use ground-start signaling on the connection between the PBX and the router’s FXO port.

D.
Shorten the amount of time that the PBX provides power denial so it will be recognized by the FXO port.