Check your npa's/nxx, and add a deny XXXXXXX into that string. Ex. the number in question is long distance from your site and is in the 270 area code.
print that area code, then change it to deny xxxxxxx
Identify the SPN that is prefix for the call you want to restrict. Then you CHG that SPN, responding "DENY" to the SDRR prompt. The the subsequent DENY prompt, you enter the digits that follow the SPN so when you add the SPN and the DENY values, it makes up the number you want to stop people from calling.
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