Incoming caller ID is marked with a + sign
My user using poly vvx250 phone set, why does a local incoming call the caller ID marked with a "+" in front of the caller ID? Normally any local calls the caller ID should not have a "+". And now the user cannot return calls based on the caller ID in the phone set call history because the caller ID starting with "+" sign is not a valid local phone number pattern. How can I remove the "+" sign in the incoming caller ID?
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