1. rtp_stream a wav file with min_rtp_port, max_rtp_port
2. sipp 3.7.1
3. With one call test (-m 1), the receiver side got the same audio as the original wav file without loss/distortion
4. With load test -r 3 -m 9, the audio from the receiver side got distorted (play the audio from wireshark pcap)

Any idea?

Thanks

/Kaiduan