Just an update to this.
The help files are wrong.
CESID works just fine.
Mitel suggested today that I do a backup/restore.
As it turns out I did a patch upgrade on that server last Friday for an unrelated problem. That would have done the backup/restore for me.
But then... Customer called and said the carrier also made a change.
Retested. Works just fine.
I don't know if the save/restore resolved the issue or the change the carrier made.
Ralph