Single on CBS by Dolly magazine cover girl Collette Roberts.
Disco single on Juana by former gospel singer and substitute teacher from Memphis. Songwriter and producer Frederick Knight rewrote an old song he'd originally intended for Stacy Lattisaw. Knight himself had charted in 1972 with I've Been Lonely So Long (#27 USA). (All Music Guide, as linked.)
See DiscoMuseum for Frederick Knight's account of the origins of the song.
EveryHit.com says Frederick Knight had recorded Ring My Bell himself earlier in 1979, but if so it appears to have been unreleased.