I had been testing the solution using +44 20 7100 6747 as the Sipbroker PSTN access number. As I said before, it returned me dialtone after I had dialled the destination number. After setting and resetting the PBXes settings, I tried it with Sipbroker PSTN access number +44 121 314 8447 and it worked first time!
I've double-checked it and it seems that my setup has a problem with +44 20 7100 6747. Could there be an issue with this number?
ataboy
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