It is a fine line sometimes. I have a court ordered visitation agreement in place and am required to provide him with some types of info. Beyond that my kids were old enough to ask if I let him know and invited him, they wanted to call him, etc. The drama for everyone continued if I hold out to prove my point. I decided that it was easier to put every scrap of info in an email and send it off. I could assure my kids their dad had the info, I could re-send it with a key stroke, and there was no further communication needed. I did not answer my phone and he mostly leaves his off so I can't call him anyway and lucky for me - the man doesn't text. Email is a GIFT for me in communicating with him. I still don't hardly ever talk to him on the phone because even though he is 95% decent now I'm not up for the 5% gamble. If he called for a contact name or schedule - I just re-sent the email, no additional info etc.
PS: I am also required to list him as a parent and contact on all school, daycare, camp, medical, etc. forms. He could raise a ruckus if I deliberately left him off that info. He wouldn't know because he doesn't follow up with the kids in that way but just a heads up for others. Check your papers if you have them. Some are quite clear on what your responsibilities are.
This might also be quite co-dependent of me but I still want to be reasonable. I am their custodial parent. I am the keeper of all that info. I suppose he could call 15 people he doesn't know to find out who is volunteering as soccer coach and then call that person (who probably only has a cell phone so unlisted number) and then be told there is no set schedule, the info is shared on the side lines at unpredictable times. It seems reasonable to me to just give him the info. Once, or in an email that can be re-sent, but I would give the info to a grandparent or anyone else not living with the kids ya know?