The system is located in germany, and yes the PBX is configured to add an initial 0 to external numbers.
For the question why… this is a good question, but I couldn’t tell you the answer. I haven’t set up the system. I am just here to make sure it works. Possible that is has something to do with the provider or with how the phone system we had before worked.
The system is working with 31 extensions numbered from 20 to 46 + some higher ones.
To call an extension you just key in the number. For an external call you have to add 0 to the number you want to call. so, if I want, for example call the number 030 123 456 78 I would have to call 0 030 123 456 78. Most of the numbers we use are saved in the phonebook. The problem is now, when someone with a number which is in the phonebook calls, the name is not shown because the leading 0 which is in the phonebook entry is not transmitted as the incoming number.
So, I need a method to add the incoming 0 to all external numbers to make sure the phonebook is triggered and shows the name of the caller, not just the number.