[Freeswitch-users] Codecs and things

[Rupa Schomaker]

On Mon, Jan 11, 2010 at 7:15 AM, Ahmed Naji <a.alalousi at gmail.com> wrote:

> 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.
>
>
The stock answer is that FS is not a proxy.  If you want a proxy use proxy
software (opensips/kamilio/whatever).  Proxy media mode is generally not the
right answer.


> 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 ?
>
>
Regular mode is just the default mode FS runs in where all media passes
through it.


> 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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-- 
-Rupa
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