Whoever owns the debt is responsible for seeing that it goes out. But they conceivably could outsource the job to the CA in some circumstances.
Many years ago I dealt with a JDB and when they said I owed them such and such and that they could give me a real good deal by taking three payments and reduce my amount owed, by 5K or whatever I said sure....: ( Well I paid, not even sure what it was for at the time, and then I got a 1099 from the JDB for forgiveness of debt. It was a bummer as I then owed taxes money plus penalty and interest. So in many instances you just do not want to pay as it will cost you a lot more unless you have all the loose ends tied up. This is where a good lawyer comes in. Woofer