Outbound calls from our UC520 work fine via a single BRI interface. However when I make incoming calls I get number unobtainable. I have logged a fault with BT and they say the line is fine. I have a single BRI interface in the ALL_BRI trunk group.
I have tried to configure a direct dial on the DID number to call the auto attendant or a hunt group. Neither works.
Does anyone have any tips on where to look next?