I don't get those type of telemarketing calls these days.
My phone list is primarily people I know whose phone calls I'm willing to answer. Basically if I don't recognize an incoming number and it is not on my list, it goes to voicemail. It's basically like the inverse of a weedout list. ;)
Write it down on the calendar and/or on post-it notes attached to the month/day in question.
Same reason why I write down the phone numbers of individuals who phone me more than once a year, and keep the list next to the telephone at home.