I am having a BLF problem with a Yealink T48G handset.
Every 20 minutes, all the BLF lights disappear and come back a few seconds later.
In syslog on the Yealink unit I get an error saying:
Aug 14 11:29:33 192.168.2.36 [00:15:65:6f:1f:90] sua : SUB <4+warnin>  BLF Subscribe response is NULL
This repeats 5-6 times, and then the phone returns to normal.
The Yealink unit has firmware version: 220.127.116.11
I am using FreePBX 18.104.22.168 with commercial endpoint manager on Asterisk Asterisk 16.11.1
I would appreciate any assistance
I tried to post the asterisk logfile but the forum doesn’t allow me to post it because it detects links (not sure what part of it is a link).