I was just playing around with the analog signaling options to see if it would display a PTT ID like it does for DTMF. Unfortunately it doesn't appear as though the radio will.
A firmware update was just recently released for the 878 and several 5-tone-related items were noted (see below)... special attention to number 7:
D878UV firmware update V1.20P (dated 2020-09-08) Change List
1. Improve the issue that radio will grab a TG when the repeater is in Call Hold Off time.
2. Improve the issue that “GPS information doesn’t display with using a programmed “GPS info” key when only analog channels are in use”.
3. Resolve the issue that “The channels program as "Simplex" and "Dual Slot", save the codeplug or program into radio, the setting will become “Repeater” after re-open the saved codeplug or read from radio.”
4. Improve the issue that “By receiving Dmr in Simplex and Double Slot mode, several times the demodulated audio of first word is missing”.
5. CPS->Channel -> Analog, R5toneBot, R5tone Eot, allows to set different 5Tone PTT ID for each channel.
6. Resolve the issue that “By composing a 5 tone using Manual Dial (Book, Manual Dial, typing Input ID and pressing PTT, the "stop code" defined in 5 tone setting is not considered as silence (stop code and stop time) but as a tone”.
7. When 5Tone -> Beep Tone & Respond are enabled, the radio will respond with itself ID.
8. CPS->Key function, add APRS send to the key function. The radio will transmit the APRS information (longitude, latitude,etc..) to the receiver when user press the “APRS send” key.
9. Improve the issue that digital monitor displays wrong time slot.
10. Improve the issue that “Keeping the sub band enabled, reception on the Main band is often lost or is very delayed”.
11. Improve the issue that “After decoding a 5-tone call in repeater mode, the 5-tone response is sent only after the repeater has dropped out”.
12. Improve the issue that “By configuring the 5 tones selective call for different call types, starting from when the RF carrier is on pushing PTT, the timing of the beginning of 5 tones sequence does not correspond to the summation of pauses configured in 5 tone setting windows in the CPS. Unexpected delay is also present using DTMF and 2 tone”
13. CPS->Channel ->TDMA adaptive rename to Slot suit.
14. CPS-> Hot key, add the "Channel Set" hot-key choice that is on the 578, to the 878
15. CPS->Digital -> Talk Groups, allows the entry of talk group numbers maximum 16777215