[Asterisk-Dev] audio and iax2 spec

[Derek Smithies]

Hi,
 iax2 spec, it seems, uses (by default) 8khz, 16 bit samples.

How does one specify (with iax2) that the audio codec is using a different 
frequency/sample size.

Further, is it possible to request more audio frames per ethernet packet?

You see, a mini frame of gsm is 79 bytes long. At 50 frames a second, that 
is 31.6kbits/sec, which is not bandwidth friendly. 

>From the table at http://www.openh323.org/docs/bandwidth.html 
h.323 uses for gsm with 4 gsm frames/packet less than 20kbit/sec

These figures have been discussed before on this list. I do remember 
someone saying that you can have more audio frames/packet.

Questions:
  How does one (in iax2) specify a different frame rate sameple size etc 
    for the audio codec?

  How does one (in iax2) request that the remote endpoint places 3 audio 
    frames in a packet ?


Derek.

-- 
Derek Smithies Ph.D.                         
IndraNet Technologies Ltd.                
Email: derek at indranet.co.nz         
ph +64 3 365 6485                          
Web: http://www.indranet-technologies.com/