IAX trunk between raspbx and grandstream

I have issue with the IAX trunk I have configured. the status is unknown and I can’t make calls through the trunk.
i get to hear: “all circuits are busy”.
Here i am attaching some screenshots of the configuration.

Here is a picture of the log of the rapberry pi.

I want to know what the cause is of the issue. And if there is something I have done wrong

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