That's the business of the phone, not the type of connection. Plug in a classic wired phone and that's how it works. Many router/ATA boxes also understand pulse dialling, so you can use a rotary phone if you like.
Many DECT phones can also give you dialtone by holding down the green button, and they you can dial as if you had a wired phone. That's useful if you want to listen to the dialtone for some reason (eg the way 1571 gives you a different dialtone if there are messages for you).
Theo