Actually, you always need something to attach the call to. A desk phone, or a soft phone.
The CTI OS desktop application does not have a built in softphone, but you may want to take a look at the Cisco IP communicator. So it's actually two applications running on the agent PC, one is the IP Communicator (= phone) and the agent desktop (= well, agent desktop).
If i understand your question correctly, u r asking for monitoring a call from CTIOS Agent Desktop without the help of Supervisor desktop. It is not possible from Agent desktop as this application is not destined for monitoring calls/ agents. Hence you can't monitor the agents/calls in Out of box CTIOS toolkit with Agent desktop.
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.