I have FreePBX on a Sangoma PBX 60 appliance, with Sangoma S series phones. My time zone under System Admin is set correctly and the time is correct; however, for some reason I always have to go into my phone template profiles and set the DST on or off. Auto will not change the time on the phones for some reason.
For some phones there is a setting in freePBX, which, if activated, prioritizes any phone device settings, which are in conflict with the pbx settings…
Problem is I can’t remember where I saw it
If you have a S-series phone, it could be a bug though…