I had a company come out today and reconfig our internal Network IPs from Public to Private. After this was completed, I checked the Phones and we have no service. I reset the IP Phones (Aastra), they picked up the new IP Addresses, I connected to the Web Interface and changed the IP Address and still no service. This company is not knowledgable in IP/Voip/Asterisk PBX. I have exhausted all possible thoughts on what to do and where changes need to be made, PBX, Firewall, and IP Phones.
Has anyone ran into this problem and found a solution and can provide me with step by step instructions on how to get my IP Phones up and running.