I had to reinstall the game. After this operation sounds were back, but..
MOH updater says I have older version and I should install newer one. Earlier it did it automatically but I didn't bother it and checked http://www.medalofhonor.com/
Actually I checked Online Service Updates: http://www.ea.com/1/service-updates
What I did see there You can check for Your own responsibility... I am a little bit annoyed.
2 hours later
I did repair the game updater. I just remove the game and installed it again.
I did update obviously.
But sound disappeared again...

Any hints?