I didn't think Mitel's ONS integrations (that's what they call their in-band dtmf VM intergration, right?) could be configured on a T1 CAS line, but I could be mistaken. If it can, then the TIMG _should_ be able to parse it.
I can't find any references to using T1 CAS with Mitel on dialogic.com or on cisco.com. So even if the Mitel is sending the call info, you're probably in a gray area regarding support.
If you can get SMDI from the Mitel, that would probably be your best bet for using TIMG. Otherwise, I would recommend following Cisco's recommended integration using the digital PIMG specifically designed for Mitel.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.