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They were never recommended. Those were EOL a long time ago.change them because v20 is no longer officially recommended
Thats the same what a reprovisioning does...You need to add window 3CX app and provision on 3CX, on 3CX admin console click on 3dots related to user extension 3CX App for Windows on the menu select open → config and copy the AuthID and AuthPass from the file and copy them into M300 Extensions and Handset the turn on the DECT handset.
you will find the below into the file
<AuthID>xxxxxxxxxx</AuthID>
<AuthPass>xxxxxxxxxxx</AuthPass>
Hope this will be helpful for you
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.