I am experiencing some issues with the GXW4104 not releasing the PSTN line after my FreePBX IVR has answered the phone and the caller hangs up.
This same problem is described here:
I am using a GXW4104, connected to Freepbx via SIP Trunk. I have an inbound route that points to IVR. When a PSTN caller makes a selection from the IVR options (after IVR prompt), and then hangs up, Freepbx doesn’t detect the disconnect and the call continues to the user’s voicemail which results in minutes of busy tone voice mail messages. While this is happening, the Grandstream shows:
Line 1: busy, PSTN Incoming (caller#): unknown
when in actual fact the caller has hung up up to 1 minute ago.
If I change the destination of the inbound route to an extension, the PSTN hangup is detected without a problem.
Another person who had this problem advised that the problem was fixed by Grandstream providing some advice on the Call Progress Tones needing to be adjusted.
I would like to know how I can fix this problem in the same manner that this person did.
Please note that I ran all PSTN Line Auto Detection Configuration tests and had the results of these test applied automatically.
I am in Australia.
Would appreciate the assistance of Grandstream or other forum members who have a solution to this issue.