How to transfer the client number when transferring an outgoing (from us) call?

Question

Telephony

The essence of the problem is as follows:
1) Clients write us a message and ask us to call back, indicate the number
2) The operator calls them back and conducts a survey
3) Next, the operator transfers the client to the desired department
Here, in paragraph 3, the problem occurs, because the department displays an incoming number our operator, not the client. As a result, we lose contact with the client.
As a result, we have to use strange schemes with callback widgets (we order a callback ourselves on behalf of the client in order to be able to transfer the number)
How can we transfer the number when we call? Tried to translate without consultation - the result is the same.

Answer 1

What PBX are you using?