[Freeswitch-users] mod_g729

Jason Garland jgarland at jasongarland.com
Tue Jan 27 09:36:54 PST 2009

If you want Speex support you need to target the chipset manufacturers:
Here is the Texas Insturments chipset that Polycom uses in the IP650

CPU is TNETV1050/C55x, rev 2 running at 162MHz with memory at 125MHz.

And here are the codecs that Chip supports from TI's datasheet on this chip:


Codec Options*
G.711 Codec, G.726, G.729AB, G.723.1A, G.722 wideband codec

Speex is not listed, so Polycom can't do Speex.

I should note that even the non-HD Polycom phones have this same chip and
are capable of doing G.722 some some config tweaking. ;)

I'm willing to bet that Cisco doesn't make their own DSP chips either. Find
out who makes their chips and put pressure on that chip manufacturer to
develop chips with Speex support.

On Thu, Jan 22, 2009 at 4:11 PM, Gregory Boehnlein <damin at nacs.net> wrote:

> > >> You use it on your own risk
> >
> > Also, G.729 is patent encumbered big-time. Instead of lining the
> > pockets of lawyers and mega-corporations by perpetuating the use of a
> > crusty old codec we should all twist arms and get our providers,
> > device makers, etc. to use Speex.
> Yeah.. let me know when you get Cisco to add Speex support to IOS! ;)
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