if you are running the correct software (I think it's R10 but not sure) you can implement the "LWC log external calls"
Set this up in system-parameters features, and page 2 of the station form. Add msg-retrieve, call display and delete buttons to the extension.
when you miss calls you will get MWI, retrieving the message will show the CLI of the missed call.
1471/*69 would not work