Hi, does anybody know the answer? Often you have to select options on service lines by typing a number on the keypad (number field in 3CXPhone). I run into the problem that these systems don't recognize this. Based on the tone I hear I thinks it's because of the frequency and/or the length 3CXPhone is sending. Is this a common issue? Maybe it has regional reasons and it works in US but not in Europe / Germany? Thanks for help ... Horst PS: if there are any questions please feel free to aks!