You need to filter calls coming from specific area codes.
Category: Client – Inbound Call Rules
How-to Block Phone Numbers
You need to block caller(s) / phone numbers either individually or by matching a desired pattern to block calls from a region or country.
Client – Inbound Call Rules
Inbound call rules can be set in order to either blacklist / block calls, or redirect them to a different destination depending on the inbound number pattern.