Recently, a new firmware for Yealink (18.104.22.168) was released and is ready to deploy via the 3CX management console. I have put this new firmware out on a few test desk phones and it's causing issues with placing and picking up shared parking slots. I've been testing to see if I can find a resolution, but so far nothing. I do notice though in the web console of the desk phone 'Features > Pickup & Park > Call Park', that the 'Call Park Mode' setting has changed. In the newer firmware, only 'FAC' is available to use. In the older firmware that still works, located in 'Features > Call Pickup > Call Park' that the 'Call Park Mode' is set by default to 'XSI'. I'm currently running 15.5.3849.1 and 15.5.6354.2 is available for installation. Would upgrading resolve this issue or is there some other issue that I haven't remedied as of yet?