<div style="margin-left:40px"><font color="#000000">I have given the rtp port range as 6000 to 8000 in rtp.conf. Is this not sufficient for running 1000 calls.<br><br><br></font></div>Only even ports will be used for RTP I think, odd ports are reserved for RTCP, although I don't know how SIPp behaves in this line. 2000 ports should be reduced to 1000 ports following my theory.<br>