You can set a line to either:
- Default ring type
- One of the 10 standard rings; Ring 1, Ring 2, etc.
You can change the default ring type to any of the custom ring tones; that is, Chirp 1, Chirp 2, etc.
I seem to recall that CCM 3.1 or 3.2 was different, but I don't have a older system to confirm this.