When making an SRTP call in QjSimple it get the following error: 14:17:10.425 pjsua_media.c Opening sound device PCM at 16000/1/20ms 14:17:10.456 pa_dev.c Opened device Microsoft Soundmapper - Input(MME)/Microsoft Soundmapper - Output(MME) for recording and playback, sample rate=16000, ch=1, bits=16, 320 samples per frame, input latency=100 ms, output latency=100 ms 14:17:10.456 ec05AB2D30 Creating AEC 14:17:10.456 ec05AB2D30 AEC created, clock_rate=16000, channel=1, samples per frame=320, tail length=200 ms, latency=100 ms 14:17:10.456 pa_dev.c Starting Microsoft Soundmapper - Input stream.. 14:17:10.456 pa_dev.c Done, status=0 14:17:10.456 pjsua_call.c Making call with acc #0 to sip:bot at pjsip.org 14:17:10.456 dlg05B0012C UAC dialog created 14:17:10.456 pjsua_media.c Media index 0 selected for call 0 14:17:10.456 transport_srtp Failed generating random key: unspecified failure 14:17:10.456 pjsua_call.c Error initializing media channel: Unknown error 259800 [status=259800] 14:17:10.456 dlg05B0012C Dialog destroyed 14:17:10.456 QjSimple: Error calling buddy: Unknown error 259800 [status=259800] 14:17:10.456 qjsimple.cpp leaving on_callButton_clicked ... 14:17:10.488 pa_dev.c Player thread started 14:17:10.488 pa_dev.c Recorder thread started 14:17:10.488 ec05AB2D30 Prefetching.. Any hints what could be the problem? Thanks Klaus