WOW lots of info.
To explain my thinking earlier. Yes the phone can be programmed in a phantom bay and it should work as programmed. However it is not working and we have 2 choices, change the way it is configured or change the environment. I have chosen the simpler route of adding the call forwarding. If my theory is correct, we will find that the x700 in question is currently in busy out status in the software. if this is the case it will cause the symptoms of saying the person is on the phone when form 19 routing is in use. Call forwarding will bypass this potential issue.
Pandabear, if Chris1234 programs as a key line I am confident that the message waiting indicator will no longer function. You can do it that way on a 3300 but the last time I tried on a 200ICP (admittedly a long time ago, rel 2) it would not allow message indicators with non-prime extensions.
Chris, try the forwarding. Failing that, we can try and get creative.
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If we don't take care of the customer, Maybe they'll stop bugging us.