We supplied some X6 Fanvils to a client as a phone to connect to the Voyager VOIP System. 

 

We have done this a number of times, though not usually the X6, and CID works fine on other sites. 

 

This one site, no phones present CID when they call out (recipient shows as unknown caller on incoming calls from this site). 

 

Updated Firmware and no change. 

 

If I set up a softphone from the same users details, CID works fine. 

 

 

 

Anyone seen this and know what might be causing it?