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How to change did number to name when incoming call

hy

I have Yeastar S20, there are 5 numbers for 5 offices but I only have 1 phone.

then how do I manage so I know that there is an incoming call for office 1,2,3, .......

because I tried a number of ways when the incoming call that came out was still a number not named the office.

 

sorry my english bad :)

 

thx

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