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We connected an RAD-1A to our new VOIP system using a Grandstream ATA with a FXS port. Everything works but when we hang up we hear a busy signal over the paging system.

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The RAD-1A will disconnect when the calling party hangs up if the ATA produces CPC (Calling Party Control) or "Loop Current Interruption". In the programming of the Grandstream navigate to the GUI Profile page and locate the Datafield "Loop Current Disconnect" next locate the "Loop Current Disconnect Duration" and set it to 1000.

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