----- Original Message -----
From: "Kris Boutilier" <[EMAIL PROTECTED]>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<[EMAIL PROTECTED]>
Sent: Tuesday, September 07, 2004 4:26 PM
Subject: [Asterisk-Users] Maximum tollerable lag/jitter for IAX2
w/ojitterbuffer enabled?
> I'm having a problem with intersite calls over IAX2 being abruptly
> terminated. Nothing odd shows in any of the logs for Asterisk or the host.
> The only think I can think it might be is a lag-spike on the site to site
> connection.
>
> How sensitive is IAX2 to lost frames, lag spikes or large variations in
> jitter with the GSM codec and:
>
> bandwidth=low
> jitterbuffer=no
> trunkfreq=100 ; Raised from 20
> tos=lowdelay
>
> notransfer=no
> trunk=no
>
> All calls are running as GSM, even though g.729 is also an 'allowed' codec
> (w/5 licenses installed). During an average call 'iax2 show channels'
> provides:
>
> Peer Username ID (Lo/Rem) Seq (Tx/Rx) Lag Jitter
> JitBuf Format
> 10.0.40.140 astpbx-woo 00002/00002 00005/00006 00040ms 0036ms
> 0000ms GSM
>
If you can reproduce it, this smells like a bug... IAX runs over TCP and TCP
doesn't just disconnect sockets unless it recieves a RESET or a FINISHED or
there's a timeout (usually like 5 minutes or more depending on your TCP/IP
stack). Needless to say that to disconnect a TCP connection, that would have
to be one hell of a lag spike... * must be actively disconnecting the
connection....
I've heard the jitter buffer is a bit buggy, have you tried turning it off
completely?
Hell even SIP won't just disconnect you unless your UA tells it to do so...
-Chris
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