Just register at any IAX server and try to call any number. If the Audio devices are correctly setup, it will crash with the following message:
Sat Dec 2 01:50:15 2006 IaxWrapper::configureCall(acc number 0) configuring call
..
Sat Dec 2 01:50:15 2006 IaxWrapper::configureCall(acc number 0) account number=0
, account alias=Kimsufi
Sat Dec 2 01:50:15 2006 IaxWrapper::configureCall(acc number 0) callerId=Florian
Jensen
Sat Dec 2 01:50:15 2006 IaxWrapper::configureCall(acc number 0) callerIdNumber=1
00
Sat Dec 2 01:50:15 2006 IaxWrapper::configureCall(acc number 0) codec=ulaw
Sat Dec 2 01:50:15 2006 IaxWrapper::configureCall(acc number 0) filter flag=27
Sat Dec 2 01:50:15 2006 IaxWrapper::configureCall(acc number 0) silence threshol
d=1
Sat Dec 2 01:50:15 2006 IaxWrapper::configureCall(acc number 0) devices in=0, ou
t=0, ring=0
Sat Dec 2 01:50:15 2006 IaxWrapper::dial(int, QString) dialing 100:xxx@jonathan-
voip.ath.cx/*98 ..
Sat Dec 2 01:50:16 2006 IaxWrapper::event_state() processing IAX event..
Sat Dec 2 01:50:16 2006 IaxWrapper::event_state() call state 0 : active=1, outgo ing=1, ringing=0, complete=0, selected=0 registrationId=0
Sat Dec 2 01:50:16 2006 IaxWrapper::event_state() call info 0 : remote=*98, remo te_name=100:<email address hidden>/*98, local=Florian Jensen, local_context=de fault
Sat Dec 2 01:50:16 2006 IaxWrapper::event_text() Message: Type=1 Message=Call 0 accepted
Sat Dec 2 01:50:16 2006 IaxWrapper::event_state() processing IAX event..
Sat Dec 2 01:50:16 2006 IaxWrapper::event_state() call state 0 : active=1, outgo ing=1, ringing=0, complete=1, selected=0 registrationId=0
Sat Dec 2 01:50:16 2006 IaxWrapper::event_state() call info 0 : remote=*98, remo te_name=100:<email address hidden>/*98, local=Florian Jensen, local_context=de fault
Sat Dec 2 01:50:16 2006 IaxWrapper::event_state() ACTIVE_CALL_ESTABLISHED 0: *98
Sat Dec 2 01:50:16 2006 IaxWrapper::event_text() Message: Type=1 Message=Call 0 answered
Sat Dec 2 01:50:17 2006 IaxWrapper::event_unknown() Uknown message: Type=4
PaHost_WatchDogProc: killing hung audio thread!
Killed
Don't set you own bugs to confirmed. What version of Ubuntu are you using? Is this still an issue?