If you want to assign leads to a specific agent, do the following:

1. Make a filter view of the leads A phoner must be assigned.

You can find help for filter view here:
Data Filter
Campaign Filter

2. Go to the filter and add an action by selecting "Actions":

3. Select the action "Edit/move leads" followed by "Assign to user" where you choose which agent to assign the leads to. Finally, select "Execute action":

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