Question about T28 "handling multiple incoming calls"

[Yealink Support]

Hello,
To help to clarify the issue ASAP, i still need to confirm these informations(So i can test it at my side):
1. Are they use the same extention on the all line keys? Or they have different extention(on different PBX)?
2. "when you have 4 calls waiting on a T28, the operator has difficulties to go from one call to the other because the incoming phone number is not written in front of the label."
Do you mean before you answer all of these calls? It means when you talking with someone, then there are three incoming calls are waiting for you answering, then you don't know which call should answer first, because you can't see their number or the name?
3.Here i tested with our latest firmware x.70.0.130 at our website, and when there's several incoming calls, i can press UP or DOWN navigation key to check their number or name, so i can decide which call should be answered first.
Please let me know whether i misunderstanding your meaning.
Thanks.