Inbound caller IDs all miss the leading zero. This seems to cause the name lookup to fail in the local directory. If I change the local directory number to reflect the missing 0 then names are displayed on the phones for inbound calls. If I change the directory number to have a leading 0 or even a leading 90 then only the number is displayed on the phones for inbound calls. By the way, the caller ID displayed on the phone is always missing the leading 0. How do I configure my UC520 to be able to use the local directory for inbound as well as outbound calls?