Some hopefully useful information:
There are seven STAR approach routes around Charlotte. FILPZ and PARQR are to the northwest and are on 125.35. BANKR and JONZE are to the southwest and are officially on 126.15, however much of the time the pilots will call on 125.35. The approaches from the east, CHSLY, MLLET, and STOCR, are on 135.6.
125.35 FLIPZ and PARQR (northwest)
126.15 CHSLY, MLLET, and STOCR (east)
135.60 BANKR and JONZE (southwest)
Sometimes the pilots will stay on these frequencies until they are on final approach and are told to contact the tower. During peak times they may instead be passed off to 132.7, 119.3, 127.7, or 119.4 once they are on downwind. Flights to the west are usually passed to 132.7.
Source: Published charts (
https://www.airnav.com/airport/kclt) and experience listening to these frequencies.