as I understand, it can change preffixes of incomming calling numbers.
for example: lets say that someone from ph# 588321 calling to me, my telco appending preffix 2, it is city code, to originator's number, I got the 2588231 calling on my side.
I want replace preffix 2 with my trunk access preffix 9 for simplify callback if this call was unanswered. I should get the 9588231 on my phone's display.
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