From CC support:
In general, if you would like to dial out towards our services, you will need to dial the full 11 digits to do so, as described on the following FAQ (
http://www.callcentric.com/faq/6/181).
If your device supports the ability to have complex dialing patterns, you should be able to configure your device to perform 7 as well as 10 digit dialing. From our records, as you've pointed out already, we see that you are using an Obi202, which should support the ability to perform 7 digit dialing. If you would like to perform 7 digit dialing within your Obi202, please visit the "Service Providers >> ITSP Profile >> General" configuration page, and set the following on the "DigitMap" option:
"(*75xx|**275x.|<:1NPA>[2-9]xxxxxx|1xxxxxxxxxx|<1>[2-9]xxxxxxxxx|011xx.|xx.|(Mipd)|[^*#]@@.)" (without the quotes)
* Where NPA is located, please place your area code; i.e. 212
So if you would like your device to automatically prefix "1212" given if only 7 digits are sent to the device, please use the following dialing plan:
"(*75xx|**275x.|<:1212>[2-9]xxxxxx|1xxxxxxxxxx|<1>[2-9]xxxxxxxxx|011xx.|xx.|(Mipd)|[^*#]@@.)" (without the quotes)