Voice over GPRS?

Robert Michel openmoko at robertmichel.de
Fri Feb 2 17:58:45 CET 2007


Salve ROB!

ROB schrieb am Freitag, den 02. Februar 2007 um 11:37h:

> Bit rate=sampling rate x bit depth
> 
> 1kb/s isn't going to get you too much audio.  
I wrote 1KB/s and I meant 1kB/s, or 8000 baud.
Already tested quality=0  speex and iax succsessful.

Maybe I did something wrong but this gives realy
a good enough quality - consider how old the GSM codec
is.

From my /etc/asterisk/codecs.conf

[speex]
; CBR encoding quality [0..10]
; used only when vbr = false
quality => 0

http://www.voip-info.org/wiki/view/Asterisk+config+codecs.conf
quality 0 = mode 1 = 2,150kbps. 

From asterisk CLI:

    -- Executing Dial("SIP/rob-c7c7",
       "IAX2/astblufunk:[astblufunk]@asttangop/17241") in new stack
    -- Called astblufunk:[astblufunk]@asttangop/17241
    -- Call accepted by 84.16.228.211 (format speex)
    -- Format for call is speex
    -- Accepting AUTHENTICATED call from 84.16.228.211:
       > requested format = speex,
       > requested prefs = (),
       > actual format = speex,
       > host prefs = (speex),
       > priority = mine
    -- Executing Answer("IAX2/asttangop-10", "") in new stack
    -- IAX2/asttangop-9 answered SIP/rob-c7c7

I promise to put examples on my webpage in 14 days.

Greetings,
rob




More information about the community mailing list