how can I find a phone extention if it comes accross as uknown caller?

hi experts,
 we have a polycomm in our conference room but it's not labeled. When we call our cells from it, it comes acrross as unknown id. how can we find out what extension that is?
frankbustosAsked:
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BillBondoConnect With a Mentor Commented:
Can you call a display phone (digital) within your building? Just imagining your setup is the same as mine.
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frankbustosAuthor Commented:
thanks!
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