As I might have said elsewhere, this was what I had to do for a recent customer
You will need to run some middleware that logs into the port and sends it back out to a serial port.
I used aggsoft Data Logger Suite and Virtual Null Modem to connect a customers call logging application. The Logger Suite connected to the Mitel via IP and sent it back out to a virtual com port which was looped back to the one the customers smdr application looked to for data. They had to adjust their data locations by one place to over come the difference from the axxess stream.