Hi all,
Well... Success! (to a degree)...
Sorry it took as long as it did. Can't post the details yet (and don't want to give it to competitors).
Just finished today.
Calling desk-desk works both ways.
Calling from Mitel to Toshiba shows the Mitel ext num and name.
Calling from Tosh to Mitel doesn't show ext/name but may have to play with URI some more.
Tosh can dial out of the Mitel trunks.
Mitel cannot use Tosh trunks.
Cannot use centralized vmail or any other "Qsig" type apps. Really only good for desk-desk calling (for now).
BUT IT WORKS!

Thanks to Tony for getting me the info to start with!
Thanks to all.
BTW, CIX running MT025
MIPU01_14DA200
Will try after upgrading firmware on MIPU...

Dave


Manager of technical services
Mitel/Toshiba dealer for 25 years
TAG member