[Asterisk-Users] IAX2 channel problems

[Simone Cittadini]

Jon Schøpzinsky ha scritto:

>
>We have been having problems with our IAX2 channels for some time now.
>Our problems are jitter, and lost packets, resulting in bad audio quality.
>
>The weird thing is, that this mostly occurs on our local network.
>We have tested the network with pinging an hour, without any lost packets.
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>One of our customers also has problems using IAX2, and he is only two networks away, according to traceroute. He is on a 100mbit dedicated connection.
>
>Is there a general problem in the IAX2 channel, which causes jitter?
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>We are running 1.2.9.1, and have tried 1.2.7.1, 1.2.5 and 1.2.0, and we have the same problems with all of them.
>
>Our average system load is around 2-3, and we have 905 registered sip users, and around 60 calls running at all time, to queues, SIP and Zap channels.
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On our system when the load is around 3 we lose packet in iax, but due 
to excessive load, simply decreasing the number of calls solves the problem.
fastagi and load balancing greatly mitigated the problem. Also forcing 
jitterbuffer on machines "not at the edges" was a problem. I leave it 
enabled only on the machines with digium cards and ata connected. I also 
use sip when possbile, a lot of people from previous posts reports sip 
being better than iax when jitter comes to play, but in my experience 
1.2.7 works quite well