I thank you for your responses as I would like to get it working without adding a router. I hope you will continue to be patient with me as when I took the course in 2012, we did not touch on NAT or 3rd party SIP devices very much.
JJordon,
I am not sure, but I suspect you have a PEC (Processor Expansion Card) on that system. If you do and you haven't provided it with its own Public IP address then you will have audio issues.
I don't believe there is one, just the base unit (wouldn't I see it in System>controller?)
As for registering you need to make sure that port 5060 is open up for the system, both cards if you have them, as this is the only port it uses to register with. What I have run into is that some SIP aware devices in the network like to change the messages, especially if there is a SIP and SDP mismatch, which the 5000 loves to do. Also if you have a PS-1 them SIP devices register to them instead of the Base Processor like the IP Phones do; that is a catch-22 most forget about.
The system itself is sitting directly on the Cable Modem, so nothing should be blocked (they have a 5-pack of static IPs, so Charter configures it in IP-passthrough, ergo, no firewall). Also, they use exclusively IP phones and all those work. The system itself has an outside IP address. When I point the polycom to it, and look in Help>About Mitel Software License, I don't see the F license in use, nor does it show in System>Devices and Feature Codes>SIP Peers>P9001(its group)>Configuration>Registrations (unlike when I register it via LAN.)
I hate to ask, but I don't remember hearing about a PS-1 or SDP...
If you know of a setting I'm missing and where it might be, please let me know. And thanks again for your responses...