[otrs] show all tickets to the agents.

hi, i am new to otrs (otrs 2.3.4 on a centos 5.2.) the problem is when a owner is assigned to a ticket,the ticket get locked, by default it is not visible to all the agents, but when owner unlocked this ticket,then this ticket become visible to all the agents, but our requirement is by default all ticket should be visible to all the agents, any configuration changes !! help will be really appreciated. -- regards: Aman