Grandstream HT503 shows ringing on deactivated FXS port?

General Help
#1

I have nothing plugged into the phone (FXS) port. I have not activated the FXS port in the GUI programming. I have the Line port (FXO) port plugged into the switch. When I dial a number to go out through the HT503 I get ringing and on the status page the FXS port says ringing? How can that be?

#2

In the fxo tab the passthrough option is enabled by default that let’s the fxs port ring even if you haven’t configure it.

#3

I thought the same thing and I have the PSTN Ring Thru FXS Set to No.

#4

Hmm, first of all put a phone on the fxs and see if actually is ringing. Also post a print screen showing the message that fxs is ringing.