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Not sure about the scenario...If the dect phone is also in Webex Calling with a number then they should be able to ring. To have them both ring you can put them in a hunt group. If you are talking about a shared line (same number on both the app and DECT) then the workspace for the DECT needs to have a professional license. Also, the shared line on the Webex App only works on the desktop version.
