You can terminate callers with a DID/ANI ring-to number, so they can talk to someone, rather than get a busy signal or be sent to voicemail. Use Control Center to add direct truck overflow to a toll-free routing plan.
You can customize the calling area(s) phone numbers that can be dialed from your SIP trunk service. For example, you can block a number from making long-distance calls or you can restrict the long-distance calling for a number to U.S. only. You can customize the calling area for each number of your service.