Jmarcwsp1,
First of all, what exactly are you referring to when you say that it is not supported by Mitel?
Secondly, IP networking on an Axxess was done with an IP Resource Card and not the CPU or even the CPC.
Third, the only issues that I am aware of that will always show up is faxing between sites. You can get it to work, but you cannot guarantee that it will work every time.
Fourth, why don't you upgrade the customer to the latest version of Axxess software? This way you get a little more $ and you reduce your service technicians headaches.
Thanks,
TE