It is possible to use OSBC in front of SER as a registrar using upper registration. And, at the current time, OSBC can perform parallel forking, far end NAT, and act as a load balancer using only the configuration files. OSBC also writes call logs into a directory for each call.
The other functionalities are not quite as straightforward
# IVR - OSBC has a media server built-in, but there is no pre-built open-source app to play IVR, so this would need to be developed
# Call Disconnect - This is possible using the low level API, but there is no pre-built open source app currently
# LCR - This is possible using the low level API, but there is no pre-built open source app available currently
# Conference Bridge - Not suppored
Note that Solegy has created all of the apps that you refer to and offers them as a hosted service. More information is available here at the Solegy website.
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