Scope in writing
A written proposal beats anyone's memory of a call — and it is the contract. Prices, dates and decisions exist in a thread you can search later.
Demos, recorded
You watch your system working on video. Rewatch it, forward it to a partner, decide at your own pace.
Any timezone, no meetings
Send the brief when it suits you; the answer arrives the same way, within one business day.
What if I really want to talk?
Write what you would have said. You will get a more careful answer than any call produces — and a record of it.