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Packet receive errors because RTP not read from media socket.
When using rtp_stream in a scenario to send media and packets are echo'd from far end and received on the media socket used by rtp_stream, the media socket recv buffer will fill up because there is no thread receiving data from that socket. Although this doesn't "break" anything, it creates "packet receive errors" on the network (netstat -asnu).
The fix which works is to start the rtp_echo_thread to do the read() from the media_socket but only do the send() if rtp_echo_enabled.
Which SIPp version are you using?
I have exactly the same problem. I use SIPp v3.5.1.