The Mitel SX2000 is a model older than the Mitel 3300ICP.
The main difference between the two is that the 3300 is
web based. If you can setup the SX2000 in the config file
to have the same output as the 3300, then you can use the
plugin, PMitel_3300icp_Certified.dll. For PABX configuration
and sample of output, see SSL MITEL 3300 Certified format.