I have a customer that has an IP Flex and she wants to send out her extension as her caller ID instead of the main office number. In the ARS, the main number is setup as the telephone number for all codes, as I would expect. Typically, on PRIs, we simply use the NSxxxxxxxxxx with the 9N code to set this up. How do I do this with the flex, as our typical way does not work. Is there a feature missing from the circuit? Or is it because the ARS is overriding?