Never worked on a 406 before. So I installed a brand new 400 phone 8 module to a 406. None of the ports work. If I plug my butt set in I get a weird dial tone. If I dial anything the port goes silent. A restart is all that brings it back.
So it is working. They are running 4.0.5 and I had 4.2.23. I tried upgrading the module only because it was worth a shot. And that fixed it. Didin't think it would. Getting any release prior to 4.2 has proven impossible.
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