I have a client with a TDA50G phone system and KX-TD343 wired ext

When you are on a call, and a second call comes in on another line, the phone displays on the screen incoming call on COXX xx= the line number for 5 seconds. I'm trying to get it so that the caller ID name or number shows instead and for a longer time, can't seem to figure it out. When I press hold i am able to see the caller ID info but it is a pain.