Question about T28 "handling multiple incoming calls"

[alambiki]

I have a problem and have no clue how to resolve it.
I installed an Elastix 2.3.0 (based on 1.8 Asterisk) in a 100 people company. I have a problem with the T28 that acts as a switchboard phone
The T28 handles multiple calls, but the person in charge of the switchboard can see incoming calls labelled as "lines". But cannot see the incoming call number with the "phone number" in front of the "line" button of the T28
Thus this confusing for the person in charge of the T28.

For example: Let say I have 3 incoming calls

Situation occuring:
On the screen of the T28, we will actually see:
Extension number (this is the label)
Extension number (this is the label)
Extension number (this is the label)
(and as you can imagine, it is difficult to take a line back when you can't remember who called you):

Situation needed
What would be great is to see. (below you can easily remember what number called you):
0472146858
0437373737
6850

I called several people and they told me it is a well known Asterisk situation.
Do you know what to do ?

Thank you for your help...!