[App_rpt-users] Codecs

[Steve Zingman]

Here is a link to the default iax.conf in DIAL

<https://github.com/N4IRS/AllStar/blob/master/configs/iax.conf>

73, Steve N4IRS

On 3/7/2017 12:59 PM, Benjamin L. Naber wrote:
> Interesting to learn some of the workings of iax.conf.
>
> I'm aware of the rest, however, I would encourage iax.conf is modified 
> to have the following priorities for every connection stanza:
> ulaw
> g726aal2
> gsm
>
> this is to ensure audio quality is better than IRLP and echo-stink. If 
> you cannot tell the difference, listen to a conversation on a local 
> repeater, and the same conversation with the convenient delay over 
> IRLP or echo-stink.
>
> You may then remember in days-past of analog cellular listening to the 
> person on the other end had more body and fidelity.
>
> Regarding bandwidth, be it a DSL or mobile connection, this should be 
> a non-issue. Even 1G cellular data connection will support two 
> full-duplex uLaw streams.
>
> For hub nodes, 30 ulaw streams is right around 2.25Mbits. If this is a 
> concern, perhaps the owner of the hub should really consider putting 
> the node elsewhere. That's like trying to put a Pinto engine in my 
> E-350 and expecting it to work the same.
>
> Considering jitter and packet loss if it is thought a higher bandwidth 
> codec will cause this, such is not the case. This is the cause of 
> little or no implementation of Qos/ToS in the WAN facing side of a 
> router. There are other external considerations, but those are outside 
> the scope of this thread.
>
> While on that subject a brief description of an example is the node at 
> my home. My connection, fortunately, has maintained +25Mbps down and 
> 5Mbps up, I've have zero issues with jitter and packet loss with QoS 
> implemented, even while the kids are watching netflix, skyping, and 
> watching something on youtube.... all at the same time.
>
>