Connect with a view to doing what ? Are you thinking of features through CTI (signalling etc.) or PC based admin connecting through a handset ?
As far as I know neither is possible, although for features I would recommend your investigation of Avaya's Voice over IP offerings. As you are probably aware, the ECS platforms can be "IP-enabled" easily through the use of C-LAN, Med-Pro / Prower (named after it's creator) and code version 9.
Version 9 also offers adminstration via a telnet-like session (as possible with Intuity for a long time now).
This is a real development, but was too slow coming.
Hope this helps
Giles