I am pretty sure that as long as transfer is programmed on the correct key it should always show up when on a call. There are options that bar trunk to trunk transfers. Post the TNB of one of the sets with the problem. Also prt NET data in LD 21 and post.
I also found this on Nortels website could be the same issue.
Symptom:
Problems when transferring calls.
3904 set not able to transfer same call twice.
3904 transfer not working properly.
Transfer softkey disappears after first transfer on 3900 set.
M3904 display is corrupted.
The problems I know about are on 4.5, but were similar issues when you downloaded new firmware it would display a big X and would not work. You are probably going to have to get the firmware reinstalled in the PBX. Until then I would not download anymore sets because once you see that big X they are unusable.
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