When a Lead has been tagged as a DNC, the system checks the numbers in that Lead and will add all those numbers in the DNC List.

In the case that number is already in the Hopper, the system will automatically remove that Lead from the Hopper making sure that it will not be dialed anymore.

 For Example: An Agent tagged Lead A as DNC and that Lead has 2 numbers. The primary phone number is 8188181245 and the cellphone number is 2122127845. The system will add both numbers to the DNC list.
In the Hopper, the system sees that Lead B is already in the Hopper, but it is using 2122127845 as its primary number.
The system will automatically remove Lead B from the Hopper to make sure that it won't be dialed again.