I am attempting to attain a load of 1000 calls, split between 4 instances of
sipp on the same host running 250 calls each.  Somewhere around 600-700
calls, I start seeing timeouts, e.g.

 Aborting call on UDP retransmission timeout for Call-ID '
[EMAIL PROTECTED]'.

The funny thing is, I can't find this Call-ID in my SIP
logs.  I capture the SIP traffic using 'ngrep' on both the UAC host and the
UAS host.

I know UDP is unreliable, but it would be surprise me if sipp was actually
sending multiple retransmissions with the same Call-ID and the UAC dropped
all of them.  My UAC and UAS are both on dual-Xeon dual-core Linux
boxes, on an isolated Gig-E switch.  My scenario file was created using
'sipp -sd uac_pcap', and includes retrans="500" on INVITE.

Any suggestions would be most welcome,
--
-Ken
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