After two days research finally i understood where is the problem.
In my DirectAdmin in "Domain Pointers" i manually created ALIAS
celebritybeep.com -> mobifor.com
So after this action server knows where should to point celebritybeep.com and everything was working.
But it is manual action... If i will have 100 clients, so i will have to add point 100 time to mobifor.com
So it is possible to do that all domains will have auto ALIAS to mobifor.com ?