[arm-allstar] Audio codec g711

[David McGough]

Chris,

I obviously have been out in the COLD WX too long today---the WX has been 
crazy COLD here in SE NC!

G.711 and ulaw are the same thing. My ramblings, below, were supposed to 
be about the G.722 wideband CODEC. I added G.722, since  I use G.722 with 
my Cisco SCCP phones, and once a call is established, they can't 
dynamically switch CODECs.

Ho Hum. Brain Fart. Sorry about the confusion!

73, David KB4FXC



On Sun, 7 Jan 2018, "David McGough via arm-allstar" wrote:

> 
> Hi Chris,
> 
> The G.711 CODEC won't currently get you any additional audio quality when 
> using the current app_rpt channel drivers--these channel drivers are all 
> limited to 4KHz bandwidth (8KHz sample rate). You'll get the very best 
> AllStar audio quality using the ulaw CODEC.
> 
> I added the G.711 CODEC for interconnectivity with Cisco SCCP phones,
> where I run G.711 exclusively. And, SCCP can't dynamically change CODECs
> like some other protocols, such as SIP.
> 
> As for node interconnections, Asterisk will typically transcode from one 
> CODEC to another, as needed.
> 
> 73, David KB4FXC
> 
> 
> On Sun, 7 Jan 2018, "chris novara via arm-allstar" wrote:
> 
> > I'm reading that allstar supports a higher quality codec of G.711
> 
> I know we use ADPCM now. I'm recording about 55 kB of bandwidth in each 
> direction now per connection on my hub.
> 
> I'm interested to learn if I change my dedicated nodes to this G.711 does 
> it work? If so, can someone tell me how to do this?
> 
> If I'm successful in upgrading, if a user connects to me using the 
> standard adpcm codec, will we be able to talk?
> 
> I would love to try this!
> 
> 
> 
> 
> Chris Novara
> Phone: 541-778-1175
> Eugene, Oregon 
> Email-Chris at redcrosscommunications.org
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