I have an Adtran Atlas 800 in front of the DK424 on the PRI line. I can see the call setup messages through the Atlas. There is no caller name coming in from the carrier or being sent to the Toshiba. I do see the full caller ID number coming in and going out. I can use the Atlas to send inbound calls to either a PRI or a T-1 card in the Toshiba. No caller ID presented on the phones either way. I can use the Atlas to route calls to its own BRI ports based on called number. In that case a BRI phone set displays the caller ID correctly. Oh -- and, if I bypass the Atlas, the Toshiba will not display caller ID that way either.