For anyone reading this (oldish!) thread - the latest firmware update sorted it for me... I had the 3xx version now have 5.2.13Caller id works pstn 100% now (Germany) - couldnt get it to work with old firmware- (only worked voip)btw- I  needed to use...

Wow - only managed to get it to work the the second method - tftp - (once I got the file name right! ) Tried for ages to use the upgrade exe-file - and couldnt get it to work. Super with tftp tho- cid is fine now -highly recommended - thanx Patrick W...