Asterisks in authorized Numbers for DND

[gerdman]

Hi,
my Fritzbox has internal numbers with Asterisk (**).
In my office, only my secretary should call me , when I hav activated DND.

Problem is: I try to activate DND Emergency, with the authorized Number **613. But phone (T46S) says, that only numbers are possible, no ** . Can this problem be solved anywhere?

Best regard, Gerd