How to get rid of "hanging" lines?

Question

Asterisk

Hello!
There is an FXO gateway Grandstream GXW410X connected to Asterisk and analog PBX Panasonic. The gateway is used to connect "analogue" subscribers with numbers on Asterisk. We
began to notice the situation that the lines "hang" (the status of the line is busy, although there is no conversation in fact)

As far as I can understand, this occurs due to the fact that the gateway cannot be coordinated with the PBX about ending the conversation. I know that there are some "terminators" for such purposes, but I could not google such devices.
Please tell me how to solve this problem? Tell me the device or maybe dig into the gateway settings?
Thank you!

Answer 1

The best solution is to cut out this collective farm and buy a KX-TDA0490XJ board in Panasonic. It fits perfectly with asterisk and just works.

If you want to go the hard way, you either need to force your FXO to divide the polarity reversal at the end of the conversation - this is how Panas understands that the line is free, or buy/shop fenders ( not terminators), devices that crash into the line and detect the end of the conversation (short beeps) and reverse the line.

Answer 2

This thing is called a "rebound detector". In fact, it does not work with all gateways. My Yeastar TA410 is buggy with a detector, it works fine without it.