Yes. Thanks to @dcaliste we now have the ability to block numbers, one by one via the GUI or more widely by using commands in the terminal.
In example, here is the command used in France to avoid known advertising numbers:
dconf write /sailfish/voicecall/filter/ignored-numbers ["’^+33162’, ‘^+33163’, ‘^+33270’, ‘^+33271’, ‘^+33377’, ‘^+33378’, ‘^+33424’, ‘^+33425’, ‘^+33568’, ‘^+33569’, ‘^+33948’, ‘^+33949’, ‘^+338060’"]
This will block all numbers beginning with “+33271” etc.
To check how it went, you can use:
dconf read /sailfish/voicecall/filter/ignored-numbers
There is also rejected-numbers
instead of ignored-numbers
.