Asterisk Group Call Pickup - BLF and Visual Indication of Calling/Called Number

Hello!

In Europe, most telephony systems are implementing Group Call Pickup like that:
e.g. extension 100,101,102 are in a pickup group.

An external caller, calls extension 102
On 100 and 102 the following happens:

  1. A BLF Key blinks to indicate the possibility to pick up the call - if you press the key.
  2. A visual indication in the Display shows up, with the information of the calling party and the called party

I am missing this feature in the Asterisk featureset.
What I’ve read and tested so far:

To make a BLF Key blinking - I can use a virtual extension and hints to make this possible → The problem, I am not able to pick the call with the same Key, right?

To have the Calling number and called number displayed in the Screen, I have the following options (specifically for Yealink phones)

  1. Use XML / SIP Notify XML to send a Text to the Display - I don’t know if the implementation is possible, the pjsip_notify.conf is read only once at asterisk reload, so I would need to reload asterisk on every call to a pick up group, which seems not to be a good idea.
  2. Yealink phones are able to make a visual indication of BLF, but this happens to all BLF Keys, also if there is a direct call to e.g. 105 and 105 is set as a BLF Key on the Phone

As far as I know, most telephony systems can subscribe to the group call pickup feature extension number (e.g. *8) and get a SIP Notify, whenever there is a call for the Pickup Group they are in - the information from this SIP Notify is display in the screen.

Is there a possibilty to make that feature available, have you got any ideas or hints for me to do so?

Thanks and Best regards,
Manuel

Here is an example of another telephony system - how a Group Pickup is handled:

*7 is the feature code for Group Call Pickup.

The SIP Extensions Subscribes to this Feature Code:

grafik

If someone of the Group get’s a call, there is a SIP Notify message:

grafik