Hi Michael,
Monitoring SRST devices via the link you've indicated does require the devices to be configured under the CISCOEXPRESS configuration. You would need to configure these via the Windows Client or GUI. You would also need to ensure you have the IMX/IUX products licensed in order to run the related collector - irCXCOL.exe.
I don't believe there is any cost associated with those products, and you can open a support case to request these be added in if they have not been included in your current license.
For more information on how to configure these devices, please refer to the online help under:
Home>Prognosis for Unified Communications>Cisco Express Suite
You can also monitor any Cisco IOS router using the CISCODEV collector. This option provides status and basic device information (CPU, memory for example). Again, this would need to be configured via the GUI.
For more detail on this option, refer to the following in the online help:
Home>Prognosis for Unified Communications>Standalone Gateways and Routers
Please let me know if the information above answers your question!
Regards,
Scott