OXE / ALE 400 - How to know who is on the phone with whom

[bkmu]

Maybe here I have more luck.

I wanted just to ask because I'm not a phone technician and I am looking for a second opinion.

We have Ale-400 phones with OmniPCX Enteprise PBX.

As the title says, our need is, with ALE-400 phone and by pressing the specific supervisor extension key on the attached module, to know who is on the phone with whom.

For instance, I am the telephone operator (the "attendant") and I am asked by my boss to tell him with whom John is on the phone because he need to talk to him but he results busy. If I have the supervisor key for John properly configured, am I able to tell my boss this information?

Earlier, with Aastra Matra PBX we could get this info by pressing the supervisor key of the specific extension on the attendant telephone; on the display was shown the number of the person who was on the phone with him/her.

Our business partner that recently installed this new PBX told us that it is no longer possible nowadays.

Frankly I doubt.

I don't know technically in the phone world how is it called this specific feature/service.

Is it possible to set it up or not?

Thank you.
Francesco