Each Ring Profile contains 10 ring patterns. If you don't like the default ring patterns, they can be modified. I don't know why there are 2 ring profiles instead of one with 20 patterns.
See:
http://www.obihai.com/OBiDeviceAdminGuide#_Toc367543110Ring Pattern 1: 60;(2+4)
60 = The pattern will repeat for a max of 60 seconds.
2 = Ring for 2 seconds
4 = Silence for 4 seconds
Repeat
Ring Pattern 2: 60;(.3+.2,1+.2,.3+4)
60 = The pattern will repeat for a max of 60 seconds.
.3 = Ring for .3 second
.2 = Silence for .2 second
1 = Ring for 1 second
.2 = Silence for .2 second
.3 = Ring for .3 second
4 = Silence for 4 seconds
Repeat