If you have access you can also fire up an 11.5 UC cluster through Cisco DevNet which will give you a Pub/Sub/IM&P and a DC wich could be handy in the early stages https://developer.cisco.com/docs/sandbox/#collaboration/featured-sandboxes https://devnetsandbox.cisco.com/RM/Diagram/Index/e74d07c5-0fda-4aa0-bb41-2b4f256e97fd?diagramType=Topology
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Hi Leo I believe for the 89xx series phones that the 'Electronic Hookswitch feature' is configured from the preferences menu directly from the phone. Take a look there and report back if this works for you Regards
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