To operate your crossband setup according to the FCC regulations, the transmission frequency from the crossband radio to the HT must have an automatic ID with your call programmed. You don't need to worry about the other transmit frequency, as long as you are properly IDing when you transmit from your HT. If your crossbander doesn't bidirectionally repeat, then you may not need to worry about the automatic ID.
There are a couple of radios that have the ID feature built in.
- Glenn W9IQ