I'm in over my head on this one, as an end user, but we recently switched to Comcast with no significant issues or re-programming.

Based on your questions and apparent level of knowledge, I have to agree with MooreTel that a qualified Nortel technician is in the cards.

I do see a couple of big question marks based on your description:

1) if you were set up for a PRI circuit instead of individual POTS lines (as implied by "0x32 MICS PRI") then you definately will need a qualified person to do a bit of programming, and possibly one or more line cards.

2) you mention "An Arris box", but 5 lines - the TM804 has a max of 4 lines

3) the StarTalk connects to the MICS the way it always did - there is no connection between the ARRIS and StarTalk.

4) Comcast did all the programming of our ARRIS boxes - i don't believe you can even access any of the ARRIS programming.

Again, you need a Nortel Installer that can see everything in front of them to figure out what is needed.