Integrate phosh-antispam ?
There's https://gitlab.com/kop316/phosh-antispam by @kop316 and he brought up the question if we want to integrate this into calls core. I think this makes a good example on what calls should include by default and what should be an addon. I can see arguments for both. The main reason for having it integrated is that there's countries like the U.S. where you can't meaningfully use a mobile phone without such features.
We opted for development out of tree initially to be more flexible (and even if developed in calls tree it could stay a separate program).