I recently migrated a CallManager 4.23 system to 6.11b. All went very well. The one problem that seems to haunt the users here and there is when they place a call the display will show "fake display" then it will go away and be replaced with valid callerid information. I have seen this in two 4.x to 6.1 migrations, but it is next to impossible to reproduce so it is hard to gather any info.
Has anyone else seen this?