Hi all, I develop my application by pjsip on symbian.I use VAS(VoIP Audio Services)in pjsip.After my application starts well,I call my friend by pjsip,it does well. But there are some problem later. 1.While I calling one my friend by pjsip,I call one another friend by the GSM/CDMA network,my application is ok. 2.After my application starts well,I make a emergency call by the GSM/CDMA network,my application is ok. 3.While I am calling one my friend by pjsip,I make a emergency call by the GSM/CDMA network,my application clashes. I debuged my application at the Situaction 3,I got the debug imformation: Thread [Thread id: 1393] (Suspended: Signal 'Exception 100' received. Description: Thread 0x571 has panicked. Category: USER; Reason: 21.) 5 Unknown (0x802A12F0)() 0x802a12f0 4 Unknown (0x802A12F0)() 0x802a12f0 3 Unknown (0x802A12F0)() 0x802a12f0 2 Unknown (0x802A12F0)() 0x802a12f0 1 Unknown (0x802A12F0)() 0x802a12f0