On our old version of FreePBX using the Digium addons module, I was able to have the second line button illuminate green if an extension was currently logged in to the queue.
I did that by having a phone book set with only 1 entry as follows:
Label: Sales Queue
Subscription URL: *45100#EXT
Where EXT is the agent’s extension.
This created the behavior that when the line key was pressed, it would dial
*45100 and toggle the agent in/out of queue. It would also illuminate the BLF (I think it is a BLF anyway, the line key button) when the agent was logged in to queue providing them feedback on their queue state without having to look at the wallboard.
Upgrading now to the latest SNG OS and using the new Endpoint Manager, I can’t seem to duplicate this behavior.
I have tried the BLF dropdown in the line key section of the configuration manager, but it doesn’t work. Pressing the line key will toggle the ext in/out but will not illuminate while the agent is in queue.
I would think it most certainly has something to the subscription.