TG400 busy for outgoing call

Dear all,
since some days I have a problem with TG400, Hardware Revision V1.40 0000-0000, Firmware .

I am using Sim cards of Telekom Germany and O2 Germany.

When calling outside via the Telekom sim cards my 3CX states forbidden. TG400 says SIM busy. Call is not going through.

O2 sim card is working correctly.

Nothing has been changed with the config.

Best regards


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