Richard,
This is a partial answer, since I've never used this function. If you use
the built in TNC for DX cluster stuff, you can set it to announce the
incoming data in either morse or voice. Not sure if both call and freq are
sent. The idea is to alert you that a dx station has been spotted on the
packet cluster. Settings are in one of the sub menus of menu 49. I think
default is morse, with options of voice and off.
Maybe this is what you were thinking of.
73, Steve KW3A