One of the analog phone ext is coming as busy and we can see solid light green lit on EXT on Grandstream VOIP Gateway front screen, I have total 4 Grandstream VOIP switch added on Asterisk Server. This normally happens when the EXT is talking to someone.
I have rebooted the Grandstream VOIP switch as well, but no luck. Most of the time reboot fix these kind of issues in the past. Any guess what could be wrong here.
I am using Grandstream VOIP Gateway switch GXW4232
Asterisk Version Asterisk 15.2.2