I wish I had a clear answer but even a web search shows conflicting results. Best I can say is you can certainly try one, however it may seem to lose the mute function that is on the Cisco mics. Also you may need to buy additional products to support...
I'm curious to know whether or not those inputs are "turned on". May be a setting in the CLI commands to verify that. Also possibly they are set to something else and need to be set to a different setting. Best I have for you is look here starting on...
This may be a good place to start:
https://www.cisco.com/c/en/us/products/physical-security/index.html?dtid=osscdc000283
https://www.cisco.com/c/en/us/products/physical-security/product-listing.html#PhysicalSecurityPlatforms
https://blogs.cisco.com...
Can you explain in more detail the reason for the need to remove the IVR? You may be able to put a silence file there but give it the same name. I think all of the files listed here HAVE to be there for them to work. Pg 16
https://www.cisco.com/c/dam...