[App_rpt-users] Codecs

[Tim Sawyer]

This may be of interest as well: http://docs.allstarlink.org/drupal/node/15

On Tue, Mar 7, 2017 at 10:15 AM, Steve Zingman <szingman at 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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-- 
--
Tim
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