Monitor trunk status form cisco phone

Hi everyone,
i would like to monitor from my phone (cisco spa504g) with a line kay the status of pstn trunk (only one line and with cisco phone adapter).

the key simpley should as green where the line is free and red when the line is in use, and if i press the line key i should take the pstn trunk line.

i have sarched a lot but i dind’t find nothing.

thankyou

Hi Gaetz,
Thank you for your replay. sorry i don’t understand. i have configured the analog line in trunk module, and it is a sip trunk. Freepbx registering on cisco adaptor.
Thx

Sorry, I had missed that you’re using an ATA, so the linked method won’t work for you.

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thank you!
Have you some suggestion for to do it with sip trunk?