[e2e] Skype and congestion collapse.

[Clark Gaylord]

David P. Reed wrote:

> And exactly what evidence are we considering that Skype, which uses 
> the TCP stack in the OS, does not reduce its packet flow when 
> congestion occurs?  My mention of

...

> I wasn't actually referring to whether Skype responds to congestion.  
> As a user I see no evidence that it tampers with TCP, but I plan to 
> dig further.   Actually, 

It is very unusual for a VoIP application to use TCP.  Normally UDP is 
used, and with good reason: reliable transport isn't needed.  At 
<100kbps (could even be <30k), the impact is modest for most links.  
Please post a tcpdump snippet for confirmation.

--ckg