On Tue, Mar 7, 2017 at 10:15 AM, Steve Zingman <szingman@msgstor.com> wrote:

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.

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