I'm trying to re-provision my Yealink W52P base stations using the new FXS/DECT method available with SP4 but I'm not having any luck. I am running version 15.0.60903.0. Steps I have taken are; -Removed W52P base station from extension X's phone provisioning tab (had been provisioned previously using traditional method) -Added W52P base station under FXS/DECT menu (copied and pasted MAC directly from W52P base station UI to avoid errors) and assigned extension X to it -Factory defaulted W52P base station from W52P base station UI At this point, I would have expected it to auto provision upon boot given we have the provisioning URL configured in DHCP (and working fine for other Yealink handsets). As it didn't auto provision I manually copied and pasted the provisioning URL into the W52P base station UI (tried with and without the MAC.cfg included in the URL) without success. When I try and browse to the provisioning link nothing is returned (IE returns blank page, Chrome returns HTTP ERROR 500). When I browse to any other provisioning URL (with the MAC.cfg included) I get the option to download the actual provisioning file. I suspect this is where the issue is. Just to see if this was an issue because these were previously provisioned base stations I created a fictitious W52P using a made up MAC address but unfortunately the same result is returned when I browse to the provisioning link for it. Just to reiterate, I'm not having any issues provisioning other Yealink handsets through the traditional methods. Anyone else seeing the same?