We use Grandstream phones with FreePBX because they’re much more affordable than others. But we have erratic behavior with them.
This time … the MWI (message waiting indicator) lamp sometimes blinks after a message is left. Other times it waits several days before blinking.
I’ve tried adjusting the Extensions > someextnum > Advanced > MWI Subscription Type …
with Auto - it sometimes works properly
with Solicited - it sometimes works properly
Can anyone suggest other settings to check - either in FreePBX or on the Grandstream phone?
Thanks in advance, Jason.