Current design is as such:
Site1 - FreePBX server, 4 POTS lines, 20 extensions.
Site2 - Nortel Analong, 3 POTS lines, 8 handsets.
At each site the copper cxn is delivered with the internet from the provider. We are needing to upgrade site2 in order to provide voicemail and deliver a more robust solution. We are looking to provide dialtone but need to maintain the DIDs that are mapped to the POTS lines.