Does your subscription preference center include sales calls and emails?

As part of GDPR prep (everyone's favorite 4-letter word!) we're looking at how people can opt in and out of communication from sales. We currently have an email preference center with various marketing email categories (see attached). We're considering adding a sales email category (new field) and also a sales phone call category (synced to existing Do Not Call field).

Have any of you done this? Can you share an example of what your preference center looks like? I'm having trouble figuring out the wording. Also I would love to hear how this works in practice.