[asterisk-dev] Asterisk dialup connection?

[Hans Witvliet]

On Mon, 2010-08-23 at 02:10 -0400, Jeff LaCoursiere wrote:
> On Mon, 23 Aug 2010, hadi motamedi wrote:
> 
> > Dear AllI need to offer dialup connection for my subscribers. When I put the codec on
> > G.711 the dialup connection will be successful but for the G.723 & G.729 it is not. Can
> > you please let me know what are stuffs do I need to have dialup connection when choosing
> > G.723 & G.729 codecs?
> > Thank you
> >
> 
> You cannot.  The compression algorithms in those codecs will squash any 
> kind of modem connection.  Even over G.711u I am surprised you have much 
> success.  Certainly nothing over 9600baud?
> 

???

If one can do voip over satelite with vpn either with compression or
not, why should a simple dialupmodem not work?

sure, re-recompression (in-affective as it will be) should only add
unwanted latency, and should be disabled if possible, but when using the
latest modems 48k or 56k bandwith should be obtainable.

All i could think of, is that the modem connection should allready be
up-and-running. One can shurely forget about call-triggerd modem
connections, as it takes quite some time before those modem-connections
are up-and-running, so any calling party will probably get
"busy/unobtainable/out-of-order"...

hw