asterisk users - May 2006 - Packetization configuration of IAX channels

Hi,
    I have seen a few threads where people have applied packetization
patch and have varied the packetizing rate of RTP/SIP and hence
reducing the bandwidth required for the call.

Is there a way to do the same with IAX?.
Will the tos=0x08 (highthroughput), or using the bandwidth directive help?

Thanks in advance,
Vij

Vij wrote:
>    I have seen a few threads where people have applied packetization
> patch and have varied the packetizing rate of RTP/SIP and hence
> reducing the bandwidth required for the call.
> Is there a way to do the same with IAX?.
Not at this time.  There was some discussion about making the
packetization
infrastructure be frame-based so any that IAX could make use of it, but
so
far no one with the knwoledge and skills to make it happen has stepped
up.
> Will the tos=0x08 (highthroughput), or using the bandwidth directive
help?
That will set the ToS/DiffServ flags to give the IAX packets a priority
boost, but will not reduce bandwidth requirements.
> Thanks in advance,
> Vij
Dan

Does this mean sending multiple frames per packet not possible with IAX
currently?

Thanks,
Vij

On 5/24/06, Dan Austin <Dan_Austin@phoenix.com>
wrote:
>
> Vij wrote:
> >    I have seen a few threads where people have applied packetization
> > patch and have varied the packetizing rate of RTP/SIP and hence
> > reducing the bandwidth required for the call.
>
> > Is there a way to do the same with IAX?.
> Not at this time.  There was some discussion about making the
> packetization
> infrastructure be frame-based so any that IAX could make use of it, but
> so
> far no one with the knwoledge and skills to make it happen has stepped
> up.
>
> > Will the tos=0x08 (highthroughput), or using the bandwidth directive
> help?
> That will set the ToS/DiffServ flags to give the IAX packets a priority
> boost, but will not reduce bandwidth requirements.
>
> > Thanks in advance,
> > Vij
>
> Dan
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Vij wrote: 
> Does this mean sending multiple frames per packet not possible with
IAX
> currently?
The answer to your question is tricky.  Asterisk does send multiple
frames per packet now.  The catch is that it is ALWAYS the number
of frames required for 20ms of audio (160 for 711, 20 for 729, etc).

So it is not possible today, with code that is available, to send
a number of frames greater than the number required for 20ms of audio
in IAX.

I hope that makes sense.
> Thanks,
> Vij
Dan