It looks like a couple of threads previously on here regarding the EXP 50 and the T54W phone and BLFs not working with various firmware versions, however, it seems like with PJSIP and the T54W, I still have issues with BLF freezing up and the monitored extensions go grey on the screen and the BLF lamp goes completely off. It doesn’t work until a hard power cycle of the phone in most cases. Currently running:
T54W firmware version:
This version of firmware (included with FPBX endpoint manager firmware utility), allows the EXP50 BLF keys to work again, but it seems on units without the EXP50, the keys “fizzle out” or stop working randomly. I also have the T54W with this firmware version doing the same thing on an older PBX using legacy SIP…
Not sure if things are more stable on older firmware for sure and if I should roll the phone back or what others might be doing…I’m reluctant to roll back with heavy use of TLS/SRTP and Opus on all these phones.
The latest firmware on yealink’s public website at the time of this post appears to be 18.104.22.168 which looks older than what the freepbx folks have been able to get…