The dial plan you posted will add 1480 to any dialed 7-digit number that starts with 2 thru 9. If a number starts with 1 it does not. You are going to have trouble if you ever want to dial an international number which generally start with 011xx.
You could add elements to add 1 to a 10-digit number that started with 602 or 623, for example ....
|<:1>602xxxxxxx| and |<:1>623xxxxxxx|
You generally don't need to add the @outbound.vitelity.net if you have the voip line configuration setup with outbound.vitelity.net as the Proxy.
You would have to get rid of the S0 after the 7-digit number to allow the 10-digit number starting with 602 or 623. This is because any 7-digit number that happened to start with 602 or 623 would get a 1480 added and dialed before your fingers could dial the additional digits. Removing the S0 would allow the interdigit short timer (3-seconds) to wait for any additional digits.
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