With the distinctive rings, I guess the best way to describe it is that the pattern should be different. We can't actually make it different ringtones like cell phones since that's 100% dependent on the phone.

Examples:

Ringggggggg; Ringggggg, Ringggggggg

Ring Ring Ring; Ring Ring Ring

Ring Ring, Ring Ring

Short Ring, Short Ring

Etc.

It's more about the pattern, not the sound of the ring itself.