I have an issue where my grand stream fxo gateway device does not disconnects the analog line after hearing a busy signal. i am using Asterisk pbx server.
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Would need access to your SIP server and need to know the detailed specs of fxo gateway. It happens only with the busy signal or after disconnecting a call too.
I have experience working in a call center with Grandstream Devices. I have experienced the problem you are facing now when I was working in Ecuador