First, you need to determine what service provider is triggering that state by checking the status of MessageWaiting.
Navigate to Voice Services-->SP Service (do this for each SP)-->Calling Features-->MessageWaiting
If it's Freephoneline, visit http://forum.fongo.com/viewtopic.php?f=8&t=19233#p75407.
Also visit https://www.obitalk.com/forum/index.php ... 26#msg9126
a)And does its display or message waiting indicator denote that you have a message waiting?I'm using a Panasonic cordless set
b) What firmware version for your ATA are you using?
Status-->System Status-->Product Information-->Software version
If you're using 3.2.2 (Build:58xx), it may be a Obihai firmware bug (although I'm not sure why it would affect voicemail indicator): https://www.obitalk.com/forum/index.php ... 7#msg89227