Grandstream HT-503 Trunk and POTS Interoperability

I have a Grandstream HT503 as a TRUNK for my POTS line into my freepbx system. The Grandstream is answering calls and sending them to an extension within freepbx. Is there a way to have this functionality and let the POTS phones still ring? One of my currently goals is to have a whitelist within PBX that is allowed to call and all other number FREEPBX will pickup and say kindly leave a message.

Just don’t let your HT503 to answer a call. This has nothing to do with FreePBX.

Hi, @sacing

Meng here.
Is that u connected to the HT 503 FXS port on this ?

Please stop raising dead posts.