Please let me know if this keeps working for you.
I also have a separate thread here on this issue and setting it to Inband works for a while, but I now have to reboot my 202 every morning to get it to work again. It will work for a few calls and then, some hours later, will not work again (work=post-connect conference IDs are interpreted correctly).
Very frustrating - I don't understand why the setting cannot be retained. Something seems to flip the value.
-Todd