Hi, I am using PJSUA APIs in a softphone application on Windows Mobile 6 device. When I make calls from this device to an Xlite running on a Windows desktop using G711 codec, it works fine. However, if I deploy the same application to a Windows Mobile 6 emulator running on a standard windows desktop, the Voice is transmitting only from Xlite to PJSUA App and not vice versa. Looking at the Wireshark traces, I found that there were just 10-15 RTP packets sent by PJSUA App to Xlite at the start of the media flow; thereafter it was sending one RTP packet periodically every 5 seconds with Marker bit set (which I believe indicates silence). In the reverse direction, RTP packet flow from Xlite to emulator is perfectly fine and I am able to hear it correctly at emulator end. It seems to me that limited processing power of Emulator machine is contributing to this media problem. Another potential issue may be that Sound Device callbacks are not happening periodically on Emulator. Please suggest how to find the root cause of this issue. I also checked for underflow and overflow in emulator and found following message in log file "Closing M - Input: 0 underflow, 0 overflow". Following are the traces of the pjsip log files for device and emulator (I have purposefully not included Sip related log messages in traces) :- Device 18:25:05.000 inv004F2864 SDP negotiation done, status=0 18:25:05.000 pjsua_call.c Call 0: remote NAT type is 0 (Unknown) 18:25:05.000 strm004F88C4 VAD temporarily disabled 18:25:05.000 rtp.c pjmedia_rtp_session_init: ses=004F9990, default_pt=8, ssrc=0x4ae13d6c 18:25:05.000 rtp.c pjmedia_rtp_session_init: ses=004FA598, default_pt=8, ssrc=0x4ae13d6c 18:25:05.000 stream.c Stream strm004F88C4 created 18:25:05.000 strm004F88C4 Encoder stream started 18:25:05.000 strm004F88C4 Decoder stream started 18:25:05.000 pjsua_media.c Media updates, stream #0: PCMA (sendrecv) 18:25:05.000 strm004F88C4 Jitter buffer empty (prefetch=15) 18:25:05.000 strm004F88C4 Start talksprut.. 18:25:05.000 ecsu00493B88 Vad cur_threshold updated 1-->4. Signal lo=6 18:25:05.000 strm004F88C4 RTP status: badpt=0, badssrc=0, dup=0, outorder=0, probation=-1, restart=0 18:25:05.000 strm004F88C4 Jitter buffer is bufferring (prefetch=15).. 18:25:05.000 tsx004BC7B4 Timeout timer event 18:25:05.000 tsx004BC7B4 State changed from Terminated to Destroyed, event=TIMER 18:25:05.000 tdta004F4420 Destroying txdata Request msg INVITE/cseq=2083 (tdta004F4420) 18:25:05.000 tsx004BC7B4 Transaction destroyed! 18:25:05.000 strm004F88C4 Jitter buffer is bufferring (prefetch=15).. 18:25:05.000 echo_suppress. Stop suppressing.. 18:25:06.000 strm004F88C4 VAD re-enabled 18:25:06.000 echo_suppress. Start suppressing.. 18:25:07.000 strm004F88C4 Starting silence 18:25:08.000 Remote RTCP address switched to 210.56.101.254:10884 18:25:08.000 strm004F88C4 Start talksprut.. 18:25:08.000 strm004F88C4 Starting silence 18:25:09.000 strm004F88C4 Start talksprut.. 18:25:09.000 strm004F88C4 Starting silence 18:25:09.000 ecsu00493B88 Vad cur_threshold updated 4-->5. Signal lo=5 18:25:10.000 strm004F88C4 Start talksprut.. 18:25:10.000 strm004F88C4 Starting silence 18:25:10.000 echo_suppress. Stop suppressing.. 18:25:11.000 strm004F88C4 Start talksprut.. 18:25:13.000 silencedet.c Vad cur_threshold updated 4-->16. Signal lo=27 18:25:15.000 silencedet.c Vad cur_threshold updated 16-->18. Signal lo=20 18:25:17.000 silencedet.c Vad cur_threshold updated 18-->20. Signal lo=21 18:25:19.000 silencedet.c Vad cur_threshold updated 20-->21. Signal lo=21 18:25:23.000 silencedet.c Vad cur_threshold updated 21-->22. Signal lo=22 18:25:25.000 strm004F88C4 Internal RTCP NTP clock skew detected: lsr=2712D1EB, now=27150000, dlsr=000255C2 (2:334ms), diff=10157 18:25:28.000 echo_suppress. Start suppressing.. Emulator 18:16:16.000 sound_port.c EC activated 18:16:16.000 echo_suppress. Start suppressing.. 18:16:19.000 ecsu004A1AF8 Vad cur_threshold updated 3-->5. Signal lo=6 18:16:21.000 pjsua_acc.c Sending 2 bytes keep-alive packet for acc 0 to 69.90.155.70:5060 18:16:21.000 tdta004B5700 Destroying txdata raw 18:16:22.000 ecsu004A1AF8 Vad cur_threshold updated 5-->6. Signal lo=6 18:16:24.000 echo_suppress. Stop suppressing.. 18:16:24.000 wav_player.c File port \Program Files\Emulator Build\resources\sound\ring.wav EOF, rewinding.. 18:16:24.000 inv00490094 SDP negotiation done, status=0 18:16:24.000 pjsua_call.c Call 0: remote NAT type is 0 (Unknown) 18:16:24.000 strm00584C44 VAD temporarily disabled 18:16:24.000 rtp.c pjmedia_rtp_session_init: ses=00585D10, default_pt=8, ssrc=0xbb32ea6 18:16:24.000 rtp.c pjmedia_rtp_session_init: ses=00586918, default_pt=8, ssrc=0xbb32ea6 18:16:24.000 stream.c Stream strm00584C44 created 18:16:24.000 strm00584C44 Encoder stream started 18:16:24.000 strm00584C44 Decoder stream started 18:16:24.000 pjsua_media.c Media updates, stream #0: PCMA (sendrecv) 18:16:24.000 strm00584C44 Jitter buffer empty (prefetch=15) 18:16:24.000 strm00584C44 Start talksprut.. 18:16:24.000 echo_suppress. Start suppressing.. 18:16:25.000 strm00584C44 RTP status: badpt=0, badssrc=0, dup=0, outorder=0, probation=-1, restart=0 18:16:25.000 strm00584C44 Jitter buffer is bufferring (prefetch=15).. 18:16:25.000 strm00584C44 Jitter buffer is bufferring (prefetch=15).. 18:16:25.000 strm00584C44 Jitter buffer is bufferring (prefetch=15).. 18:16:25.000 strm00584C44 Jitter buffer is bufferring (prefetch=15).. 18:16:25.000 strm00584C44 Jitter buffer is bufferring (prefetch=15).. 18:16:25.000 strm00584C44 VAD re-enabled 18:16:25.000 strm00584C44 Starting silence 18:16:26.000 echo_suppress. Stop suppressing.. 18:16:26.000 strm00584C44 Frame lost! 18:16:26.000 strm00584C44 Frame lost! 18:16:26.000 strm00584C44 Start talksprut.. 18:16:26.000 strm00584C44 Starting silence 18:16:27.000 echo_suppress. Start suppressing.. 18:16:27.000 strm00584C44 Frame lost! 18:16:27.000 strm00584C44 Frame lost! 18:16:27.000 strm00584C44 Start talksprut.. 18:16:27.000 strm00584C44 Starting silence 18:16:27.000 echo_suppress. Stop suppressing.. 18:16:28.000 strm00584C44 Frame lost! 18:16:28.000 strm00584C44 Frame lost! 18:16:28.000 strm00584C44 Start talksprut.. 18:16:28.000 strm00584C44 Starting silence 18:16:29.000 echo_suppress. Start suppressing.. 18:16:29.000 strm00584C44 Frame lost! 18:16:29.000 strm00584C44 Frame lost! 18:16:29.000 echo_suppress. Stop suppressing.. 18:16:29.000 silencedet.c Vad cur_threshold updated 4-->3. Signal lo=-1 18:16:29.000 strm00584C44 Start talksprut.. 18:16:29.000 strm00584C44 Starting silence 18:16:30.000 strm00584C44 Frame lost! 18:16:30.000 strm00584C44 Frame lost! 18:16:30.000 strm00584C44 Start talksprut.. 18:16:30.000 strm00584C44 Starting silence 18:16:31.000 echo_suppress. Start suppressing.. 18:16:31.000 echo_suppress. Stop suppressing.. 18:16:31.000 strm00584C44 Start talksprut.. 18:16:31.000 strm00584C44 Starting silence 18:16:32.000 strm00584C44 Frame lost! 18:16:32.000 strm00584C44 Frame lost! 18:16:32.000 echo_suppress. Start suppressing.. 18:16:32.000 strm00584C44 Start talksprut.. 18:16:32.000 strm00584C44 Starting silence 18:16:33.000 echo_suppress. Stop suppressing.. 18:16:33.000 strm00584C44 Frame lost! 18:16:33.000 strm00584C44 Frame lost! 18:16:33.000 silencedet.c Vad cur_threshold updated 3-->2. Signal lo=-1 18:16:34.000 strm00584C44 Start talksprut.. 18:16:34.000 strm00584C44 Starting silence 18:16:34.000 strm00584C44 Frame lost! 18:16:34.000 strm00584C44 Frame lost! 18:16:35.000 strm00584C44 Start talksprut.. 18:16:35.000 strm00584C44 Starting silence 18:16:35.000 strm00584C44 Frame lost! 18:16:35.000 strm00584C44 Frame lost! 18:16:36.000 pjsua_acc.c Sending 2 bytes keep-alive packet for acc 0 to 69.90.155.70:5060 18:16:36.000 tdta00581040 Destroying txdata raw 18:16:36.000 strm00584C44 Start talksprut.. 18:16:36.000 strm00584C44 Starting silence 18:16:36.000 strm00584C44 Frame lost! 18:16:36.000 strm00584C44 Frame lost! 18:16:37.000 strm00584C44 Start talksprut.. 18:16:37.000 strm00584C44 Starting silence 18:16:37.000 strm00584C44 Frame lost! 18:16:37.000 strm00584C44 Frame lost! 18:16:38.000 strm00584C44 Start talksprut.. 18:16:38.000 strm00584C44 Starting silence 18:16:38.000 strm00584C44 Frame lost! 18:16:38.000 strm00584C44 Frame lost! 18:16:38.000 strm00584C44 Internal RTCP NTP clock skew detected: lsr=25040000, now=25060000, dlsr=00029C6A (2:610ms), diff=40042 18:16:39.000 strm00584C44 Start talksprut.. 18:16:39.000 strm00584C44 Starting silence 18:16:39.000 strm00584C44 Frame lost! 18:16:39.000 strm00584C44 Frame lost! 18:16:40.000 strm00584C44 Start talksprut.. 18:16:40.000 strm00584C44 Starting silence 18:16:40.000 strm00584C44 Frame lost! 18:16:40.000 strm00584C44 Frame lost! 18:16:41.000 strm00584C44 Start talksprut.. 18:16:41.000 strm00584C44 Starting silence 18:16:41.000 echo_suppress. Start suppressing.. 18:16:41.000 strm00584C44 Frame lost! 18:16:41.000 strm00584C44 Frame lost! 18:16:42.000 strm00584C44 Internal RTCP NTP clock skew detected: lsr=25040000, now=250A0000, dlsr=000606A7 (6:025ms), diff=1703 18:16:42.000 strm00584C44 Start talksprut.. 18:16:42.000 strm00584C44 Starting silence 18:16:42.000 strm00584C44 Frame lost! 18:16:42.000 strm00584C44 Frame lost! 18:16:43.000 strm00584C44 Start talksprut.. 18:16:43.000 strm00584C44 Starting silence 18:16:43.000 strm00584C44 Frame lost! 18:16:43.000 strm00584C44 Frame lost! 18:16:44.000 strm00584C44 Start talksprut.. 18:16:44.000 strm00584C44 Starting silence 18:16:44.000 ecsu004A1AF8 Vad cur_threshold updated 6-->7. Signal lo=8 18:16:45.000 echo_suppress. Stop suppressing.. 18:16:45.000 strm00584C44 Frame lost! 18:16:45.000 strm00584C44 Frame lost! 18:16:45.000 strm00584C44 Start talksprut.. 18:16:45.000 strm00584C44 Starting silence 18:16:45.000 strm00584C44 Internal RTCP NTP clock skew detected: lsr=25040000, now=250D0000, dlsr=000970E5 (9:440ms), diff=28901 Regards Girish **************** CAUTION - Disclaimer ***************** This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. 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