The CallerIDPrivate and CallerIDOutSide entries identify the characters that the modem returns when it reports that Caller ID information was not sent. The information that is not sent might have been blocked (private) or out of the area.
One line -- can be one or more characters.
HKR,, CallerIDPrivate,,"P" HKR,, CallerIDOutSide,,"O"
These entries are case sensitive.