I have Thirdlane PBX Manager 6.01.72 running on a Linux Server (Dell PowerEdge R710 Blade Server running Linux) with 28 phones Grandstream GXP2020 attached.
Several phones/extensions that have problems with voice mail indicator not resetting when voice mails have been retrieved. Sometimes indicator goes on without new incoming messages.
Grandstream GXP2020 are running firmware version (boot) 220.127.116.11 & (prog) 18.104.22.168
Any insight would be appreciated.