I spoke with the operator. Here is the additional information.
We have thirty plus buttons assigned, all of them hunt groups or single extensions.
We only have two hunt group buttons that do not work. Everytime the operator tries to transfer to these two HGs, she does exactly what she does with the others, with the exception that they don't work. Nothing is displayed on the phone.
I have tried moving the HGs to different buttons with no resolution, so it is not the button. It has to be somethng in programming.
If the operator punches the transfer button and then enters in the HGs number, it will transfer.
Any further ideas on this?