On Sep 7, 2004, at 7:15 PM, Chris wrote:
Asterisk never ever uses TCP for IAX or IAX2. It's ALWAYS UDP. I don't
believe Asterisk supports SIP over TCP either. Heck, the manager port
is the only thing that uses TCP that I know of with Asterisk.
Hmmm I wonder why I had the impression that it was TCP... You're right...
Still, because UDP is connectionless and stateless it still won't disconnect
on a LAG spike. I've had UDP sit there and send packets at my machine 2
hours after it had been shut down...
You *really* don't want it to be TCP. Think about how TCP reacts to packet loss--it keeps retransmitting the dropped packet and delays everything after it until the dropped packet arrives. Now imagine what that'd do to phone calls--among other things, you'd have ever-increasing delay times, and there's no way to catch back up--after even a small amount of packet loss, the call would be unusable.
TCP's a wonderful protocol, just not for real-time traffic.
Scott
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