I have many people using iaxys and after beeting out the issue with them
to death as i use them in a production environment i can safley say if
your latency is greater than 50ms with these devices expect issues no
matter what you do. They are a cool geek item , but in terms of good ata
.... thumbs up for lan use , thumbs down for distant wan use. Its a real
shame though because there isnt many other IAX based devices that are
any good either, atcom makes an iax,sip,mgcp phone its about that same
price as the iaxy but is still pretty crap.. If you have latency of
nearly 200ms i would try chaning your tos settings in your iax.conf to
see if that helps if not ditch it and go with a solid sip phone ie ..
polycom 301 or an aastra.
phil.
George Mogielnicki wrote:
Hi;
I have few remote IAXy devices out there and have echo problems. There
was a post already few months ago advising actions to resolve it, still,
I wanted to throw few other options and ask members opinion which one
might be the most effective. I have one constrain - 200 ms latency to
the location where IAXy are used.
Options
- use KB1 echo cancellation, requires Asterisk upgrade from 1.0.9 to
1.2.
- do not use ulaw with IAXy, use ADPCM that the device should support.
Would reducing 60kbs to 30kbs help with 200ms latency ? Would even
further compression (let say GSM) improve echo problem ? I have plenty
of cpu cycles on the server.
- drop IAX devices, use SIP instead. Would a good quality SIP phone
eliminate echo ?
- I'm not using real zaptel devices. Would a real Digium card help when
I use IP only, no PSTN at all?
Thanks in advance;
George
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