Hi,
Official IMC supports monitoring features (via SNMP) on mainy Avaya devices (I saw in the device matrix, switches, voip, video, security devices). Moreover, if the Avaya device is not in the "pre-defined" Avaya device models list, we can quickly add the device model in the WebUI (using SNMP sysoid to identify it).
I also checked the adapters (for configuration management), and I found (in the latest release), that there is an adapter to manage configuration file backup and software image deploy on "Avaya ERS 8600; 8800 switches, OS version 7.x, VSP 9012 switches, OS Version 3.3.x.x.".
Finally, if you like programming, you can add your own adapter TCL scripts to manage configuration for other device models.
Fabien