[Freeswitch-users] Codecs and things

[Ahmed Naji]

Hi Rupa,

Thanks for your feedback.

One thing that caught my eye in your reply is you mentioning that proxy
media is a special hack for T38. The reason I'm using proxy mode is to fully
mask the identity of end points from each other. If there is another of
achieving this in FS then I am definitely very interested in hearing about
it and implementing it.

You also mention regular mode, and I couldn't find mention of this anywhere
in the Wiki. So far, my understanding was that you could run FS in either
proxy or bypass media modes. Can you elaborate a little bit and discuss this
a bit more ?

Thanks a lot in advance.

Regards,

Ahmed.


2009/12/23 Rupa Schomaker <rupa at rupa.com>

> On Tue, Dec 22, 2009 at 2:55 PM, Ahmed Naji <a.alalousi at gmail.com> wrote:
> > Hello people,
> >
> > Can someone please clear the following ambiguities with codecs:
> >
> > Are we definitively able to run pass-through codecs (e.g. G.729) in Proxy
> > Media mode, or does FS need to be running in bypass-media ? the Wiki is
> not
> > clear in this regard
>
> Yes, you can use proxy media, bypass media, or even regular mode if
> you don't transcode (special for g729).  Proxy media is really a
> special hack that should only be used for T38 passthrough.  If you are
> using it for other purposes, think about it some more....
>
> > When an A-leg has negotiated a pass-through media codec, can the B-leg be
> > transcoded into a non-pass-through codec, and vice-versa ? think A-leg
> > incoming with a G.729 codec, and target for B-leg needs to be setup with
> a
> > GSM-codec, say
>
> That would require transcoding - which can't be done if the codec is
> pass-through.
>
> > Where in the developer's set of documentation are codecs discussed ? I
> would
> > like to start porting some code of mine for G.729a/b/ab form a ti DSP
> > platform to FS. FS lacking full G.729 support is proving quite a
> hindrance,
> > and there is no clear direction from the dev community as to when the
> same
> > will be available. Incidentally, any news on this effort ? where are we
> with
> > code, and what's an ETA for a Beta ?
>
> I'd say look at the broadvoice or other simple self-contained codecs
> are done.  Currently the only supported g729 solution is to use a
> digium board with mod_dahdi_codec.
>
> I don't have any info on a software based g729 solution.
>
> > On the same lines as (3) above, there is a codec dev template in the
> source
> > tree. Again, where can I find documentation relating to this ? the
> template
> > has hardly any docs at all.
> >
> > Best regards and warm wishes for a Merry Christmas and a great New Year
> to
> > one and all.
> >
> > Ahmed.
> >
> >
> > --
> > Ahmed A. Ibrahim-Naji Al-Alousi
> > Ph.D., MIEE, MBCS
> >
> > _______________________________________________
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> >
> >
>
>
>
> --
> -Rupa
>
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-- 
Ahmed Naji
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