Hello. We are trialling 3CX at the moment, with a view to deployment later this year. I'm running V15 and am testing several models of Yealink Phones (T42/46/68), which are running the latest 3CX-released firmware in each case (there is a newer version on the Yealink site, but that breaks things horribly), as per below; SIP-T46G - 188.8.131.52 SIP-T42G - 184.108.40.206 SIP-T48G - 220.127.116.11 I'm running a slightly modified template (to fix timezone problem) based off the latest original template. No matter what I do, I can't get the BLF LED's to work on the handsets. Status in the softphone is perfect, so I know that all notifications are working correctly at the PBX level, but not on the handsets. Does anyone have any ideas as to what I should be checking, please?