S20 outgoing calls with prefix +42 problem

Hi, we have this situations:

S20 connected to TG200 and we have this problem:

1) incoming calls to internal extensions looks like this:

+420 123 456 789

2) we cannot callback right to this number (says: invalid number), but only with removed prefix: 123 456 789


Please, where can we set to "accept outgoing calls with prefix" or how to solve this?


Many thanks.


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