Just be warned that you probably will end up with *four* CDRs if you turn on the b-leg logging. I've tested these scenarios with Polycoms and Snoms and it is pretty consistent. Attended transfers are a challenge for CDRs but once you see the b-legs' CDRs you'll start to grasp it. As an exercise, turn on the b-leg logging and then do some experiments. For instance, watch your CDRs at these points during the call flow:

After A dials B and B answers but *before* A actually transfers the call to B
After A transfer the call to B but before B and C disconnect
After B and C disconnect

When you see four CDRs for what is essentially a single phone call it helps to know at what stage in the call flow that each of the records was created.

Have fun. :)
-MC