calling (down) the line

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I'm translating a text of a coffee company. The section, where they use this phrase, is about the tasks of the different employees.

"What are the primary tasks of the Beverage Partners?
Hot and cold beverage production to standard, calling the line if the Floater is not available, etc"

Call down the line to start customer’s beverages to improve speed of service."

What can "calling (down) the line" mean?

Thank You!
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