[asterisk-users] BLF support in Asterisk and early/confirmed/terminated/proceeding NOTIFY states.

[Jobst Schmalenbach]

I have a setup with Yealink phones & Asterisk Server (all latest patches).

I am using BLF to display the states of other phones. While this works 
MOST of the time (busy, being called) it does NOT work when a phone is 
NOT regisstered at all, the yealink phones display a green dot EVEN if a 
phone is turned off (try explain this to users, they are shaking their 
heads!!!)

I can see on the Asterisk server it shows correctly in the logs when a 
phone is disconnected.
It also advises the otehr phones correctly when a phone is busy, even if 
a person starts dialing - the red dot shows up milliseconds later on ALL 
of the other phones.

I have asked a question about this before Green Dot 
<https://community.asterisk.org/t/yealink-t46s-t46g-blf-show-green-dot-icon-even-if-not-registered/85701>

So I went and asked Yealink about this. The reply was something like 
this: “Currently the phone can only support the BLF LED display with 
early/confirmed/terminated/proceeding NOTIFY states.”

My question now is can I implement this properly on an Asterisk server?
I.e. when a phone gets disconnected that all other phones are advised 
“hey I am not available” and actually show a RED dot.

thanks

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