[arm-allstar] codecs

[Doug Crompton]

Dan,

 The hamvoip code has the ILBC (Internet low bandwidth codec) installed. It
uses about 1/3 of the bandwidth of the G726AA codec which is most commonly
used for Allstar. Its audio quality is very good and very close to G726.
Most people would not be able to tell the difference. The reason we do not
use it by default is that it poorer "squelching" than G726. G726 on a poor
connection mutes dropouts whereas ILBC tends to allow the garbage sounds
through. I often recommend that cell phone hotspot users try ILBC but
anyone trying to conserve bandwidth can give it a try. Most would not have
that issue as voice is rather low bandwidth compared to most other things
we do on the Internet nowadays. Codec settings are in
/etc/asterisk/iax.conf.  Ordering sets priority but if the called node does
not have the codec you request then it will take the next one down the list
until it is satisfied. I would recommend you try the ILBC codec and see if
it satisfies your needs.





*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*

On Sun, May 7, 2017 at 12:49 AM, "Dan Keizer via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> Curious to know if anyone has some experience with codec2 with allstar
> linking?
>
> I'd certainly like to minimize the bandwidth - and use ham developed tech
> at the same time.
>
> Speaking of such - since we want to hook up a number of nodes together, we
> are establishing a local "super node" on a high availability server located
> only a couple of hops from our 2.3GHz network.  Internet bandwidth provided
> by a supporting ham via a 24GHz air fiber.  And rackspace/hosting/internet
> for this node provided by another local ham.
> I'm thinking a stock install of allstarlink would work well for an instance
> such as this.
> Any caveats or experience with such?
>
> 73, Dan ve4drk
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