If their trunking is PRI they should be able to get name/number service..Most carriers charge extra for name service though so they might want to check with them about that to make sure they are signed up for it..
Like Tim said...if the "carrier" is sending it they should see it !!! Can't remember is a 6408D a (2)line display?...

...bob...

Bob Wells
WellComm, Inc.

"As long as nobody's dead or in jail, it can't be all that bad ! "