Yes, this can definitely be done through CCA. Say you have phones A, B, and C with extensions 201, 202, and 203 respectively set on the first button on each phone. Using CCA, create normal extensions 211, 212, and 213 on the second button on each of A, B & C, and then create extensions 221, 222, & 223 on button 3 on each phone. You can use whatever extensions you want - the numbers I have chosen here are just for simplicity.
Anyway, once you have the extensions set up, then point the first blast group to extensions 211, 212, and 213, and the second blast group to extensions 221, 222, and 223. Then, using the Settings button on the phones themselves, navigate to User Preferences > Rings and select a different ring tone for each line on the phone. Then the user will get a different ring tone depending on if the call if for them personally, if it is directed to the first blast group, or if it is directed to the second.
Of course, you don't have to have a separate button for calls direct to the user - that is just for convenience. The point is that by creating multiple extensions on the phone for different purposes, you can get distinctly different rings depending on what type of call it is.
Cheers,
Dave.
