I am attempting to ready for a TTU. For one, I have questions on understanding the ATT document that shows the IP addresses and what they correlate to elsewhere. We currently have an Avaya IPO 500v2 connected to an AudiCodes Median800b SBC. We have two test phone numbers assigned with the IPflex order and are trying to set it up to be active with our current configuration. I have more questions and can go into greater detail if someone with experience is willing to assist. I would be so grateful!