I'm confused, but it's probably just me. If Dad sees the kids every day and you have weekend visitation, why are you trying very hard to keep their Dad involved in their lives? Sounds like he already is.
That is ridiculous. My husband's ex's husband makes monkey sounds in the background when he's talking to ex. How can the kids NOT know the parent is disparaging the other with the pot banging/monkey sounds? I'm honestly not sure what, if anything, can be done about that. Maybe a senior knows.
You are within your legal rights to have the calls that are in your CO. If you aren't causing problems, then your ex needs to comply, but it sounds like he's going to skirt it a little, but not too much that you make a legal issue of it.
Personally when my kids are with their dad (8.5yo twins), I don't initiate phone calls. I used to, but I felt like I was intruding on their time and in their case he only comes in a few times a year for visits and no matter how much I miss them, I need to let them have solid time, not one foot with each parent. But, this is obviously much different than when kids go back/forth between parents that see them all the time. Different dynamics.