Engaged/busy Tone DoNotDisturb

[gillcc]

Previously when I was using Xlite If I was on a call and pressed DND this would result in a busy signal if I got another call. Now when I do this I get a pre-recorded message saying that the phone is unavailable. Is there anyway I can revert to a previous version of Xlite? or do anything to getmyself a busy tone instead. I have had to reinstall it recently. Thanks