This is the 15825th most frequent Polish word.
służbowa
Official or work-related.
The word "służbowy" here is used to describe something related to official or work duties, in this case, a trip.
Mam wyjazd służbowy do Warszawy.
I have a business trip to Warsaw.
The word "służbowy" qualifies the type of phone, indicating that it's for business or work purposes.
Telefon służbowy jest na biurku.
The work phone is on the desk.
Here, "służbowy" is used to define the nature of the lunch, denoting that it is related to work or official matters.