Hi Andrew,
What version of UCM are you running? Browsing through some release notes, there doesn't seem to be any native options to UCM that would grant you the ability to listen to multiple conference calls from a single line. I know that some third party applications that use a form of software installed on a PC will show the conferences ongoing. You can select them to monitor but that is only when using their conferencing solution and its is a single conf call at a time.
Hope this helps
Tony
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Thanks,
Tony