How avoiding the PRACK method after receiving ringing?

[norbert.weyrich@xxxxxxxxxxxx (Norbert Weyrich)]

Hi all,

after receiving the ringing status pjsip generates a PRACK method to the 
peer. How can I avoid the PRACK method?

After two or three outgoing calls (with pjsua_call_make_call) my 
application crashes after pjsip receiving the ringing status. Normally 
pjsua generates an on_call_state callback. But in this case pjsua did 
not make a callback.

Thanks
Norbert