My PSTN supplier is actually OptimumVoice. When I connect a phone to it I get to see caller's name and phone number. So, OV seems to be OK. My SPA3102 is setup with "PSTN to VOIP" enabled and configured with defaults (which seems to indicate that CID transfer from PSTN to VOIP is turned on). When I receive a PSTN call my VOIP phone connected through 3CX shows "SPA-3102" and "10001" as caller's name and number, which I believe are the info that I entered in SPA3102 in the "VOIP Line Registration" settings. Other than the CID issue, everything else works fine. Can call in and out with top quality sound. I am trying to properly configure so that I get to see the PSTN caller's real name and phone number. Any help will be appreciated.