Nechomah- the first time I called Dor Yeshorim, that is what they told me. They said that if a shidduch works out, the two parties involved should directly exchange numbers and call again, just to ascertain that no mistakes have been made.
For something as relatively painless as a two-minute phone call which can avoid a lot of tza’ar later, I would say it’s worth it to double-check (although, as I said, I have not followed my own advice).