You *have* to use ports 5060 and 5061. Other ports won't work.
So, right now I have a partial victory. I've got outgoing working (both internal and external) but no incoming (fast busy). -- Looks like Reverend Wright got his wish - God Damn America.
It does show it as registered (on both * and the ATA). I hunted around for some port or routing issue or other oddity that would prevent the 1120S from receiving any calls. I ripped and rebuilt the extension to no avail.
For clarification, everything is on the same LAN and same subnet. -- Looks like Reverend Wright got his wish - God Damn America.