[VoiceOps] Favorite network testing tools

[Jason Vanick]

I've seen some threads on pieces of this, but I thought it might be cool 
to talk about some testing tools..

I'm looking for open source (read modifiable) tools for characterizing and 
verifying network connections and their reliability for voice (rtp).

I've played with ttcp and iperf but they're really not exactly what I'm looking for.

I'll need both server and client side (client side preferably something browser (pc)
based...

What are *YOUR* favorites and why?

Thanks!
-Jason