When entering a station name using TRANS/PGM + 74 from the phone itself, I recall that there was a way to enter a name in both upper and lowercase letters. To enter upper case, you just dial the character code (like 61 = "M"), but there is a way to enter a prefix or a suffix before the character code and it would make it a lowercase letter. It's not documented either, I learned it directly from a technician and promptly forgot it.

Does anyone recall how to enter lowercase characters in the station name on the SBX IP 320?