[asterisk-users] LAN IAX2 trunk bad audio quality vs. LAN SIP trunk good audio quality

[Gareth Blades]

Show the details on the active channels when using both methods and 
check what codecs are being used.

Vieri wrote:
> Hi,
> 
> I have an audio quality problem regarding IAX2. I have 2 Asterisk servers interconnected via 2 LAN trunks at 1Gbps (no nat, no firewall).
> One trunk is SIP and the other IAX2.
> Normally, I use IAX2 but have noticed easily reproducible audio quality problems (voice in/out is OK but there's a "third" noise overlapping with a "scratchy sound" as if it were some kind of interference).
> 
> So lately I setup calls to go through the SIP trunk and audio quality is OK (no "third overlapping noise").
> 
> This is happening between Asterisk 1.4.31 and a 1.2.40.
> 
> I'm wondering if there's something I can tweak in IAX2 to eliminate this artifact.
> 
> Could the IAX2 jitter buffer between 1.2 and 1.4 be an issue (I believe it's enabled by default)?
> 
> Thanks,
> 
> Vieri
> 
> 
> 
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