I am using an app that is calling a number (e.g. +4912345) but it adds a prefix USSD code (e.g. *31#+4912345) to achieve some things in the backgropund. The call fails, it looks like Zoiper can not handle it.
Is there any way to strip this USSD code on Zoiper side? I already tried to use the strip function but it does seem to just use every single char I input and doesn't let me group anything.