There are some cases like Jabra Speak2 55 which are supported according to https://help.webex.com/en-us/article/nrivbbab/Webex-App-%7C-Details-about-headset-support#reference-template_4097e905-9111-4042-bf63-8f3f5465048b that remains MUTED after a webex meeting is ended.

To these devices it would be nice that webex sends the UNMUTE signal to the headsets to change their status and be ready for the next meeting.