I follow a similar IVR for this as well. The only thing I add is IRoute to allow my local area code to have calls ring the phone. Eventually when I know I have have my address book set then I might use whitelist only.
Yes, the IRoute control is very good when you need to whitelist a number range.
Anveo Call Flow feature makes it possible for each customer to get a tailor made VoIP provider. -- My VoIP News
I just don't have room for the hangup. I'm already at 10! Time to upgrade.
Upgrade is a good idea. However, if you want to save flow items you can use extensions.
The limit for the Free subscription plan is 10 items per Call Flow. So by using several Call Flows you may be able to keep it at no more than 10 items per Call Flow. -- My VoIP News