Show "called line" on phone?

[Voodoopupp]

Hi,

I am new to the forum because we are interested in buying some of the Yealink phones, but before we can get to the buying process, we need to clear out some things.

Now I am unaware of this question:
I know it is possible to use multiple lines - this means a telephone can receive calls under different numbers, right?!

But I am not sure if it is possible to do it as we want it!

Here is an example what we want to achieve:
there is "Bob" who has the internal number "12", so he can be called by XXXXXX-12 for sure.

Now we have defined some external numbers in our "PBX" (bintec elmeg be.IP Plus):
XXXXXX-10 -> Sales Department
XXXXXX-20 -> Marketing
XXXXXX-30 -> Customer Service
XXXXXX-40 -> IT Service

These external lines are mapped inside of the PBX to "Team 85"
So Bob is one of the people who is responsible for all the mentioned external lines abd therefore he is logged in that Team.

So now a call is coming in at XXXXXX-10 (Sales) from customers Number 123456789, the PBX is throwing the call to Team 85, and there line "12" is the first member. So Bobs line 12 is ringing now.

How does Bob know, that the number the customer called is "Sales"?

Would be perfect, if the display can show:
123456789
is calling
"Sales"

Then Bob knows which program on the computer he needs and also how he should answer.

Is this possible and how?

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And no: we do not want to use different "teams/groups" inside the PBX and Bob gets different numbers for all the teams like:
11 - Bob Sales
21 - Bob Marketing
31 - Bob Customer Service
41 - IT Service

We want to have only one number per user, so that they can login/logout from the "Team 85" easily with only one button. Because the users are not at their desks all time.
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Best regards
Vodoopupp