Step 1: Login to Administrator and then select Telephony à Lists
Step2: Click on Add/Delete DNC Numbers
Step 3: You can Add/Remove phone numbers individual. Enter phone numbers, and add/delete then Click Submit.
NOTE: One phone number per line, maximum 25 numbers you can add/delete.
Whether you want to put bulk of phone numbers in DNC .First we have to create the list of phone numbers that you have to put in DNC.
Step 4: Telephony à Lists and then Click on Upload DNC Numbers
Step 5: Choose the file (.CSV). Now select weather you want to add/delete then Click Submit.