[Freeswitch-users] [Callweaver-users] A patent list for codecs

[Wasim Baig]

http://www.voip-info.org/wiki/view/Codec+Patents

On 6/17/07, Steve Underwood <steveu at coppice.org> wrote:
>
> Hi all,
>
> There is an issue which is common ground for most free telephony
> projects - codec patents. In the near term we need to live within the
> constraints of these patents, but they won't last forever (well, not as
> long as Disney isn't a big patent holder). The snag is working out when
> they will be free. There are several relevant encumbered speech codecs,
> potentially useful for what we do. The obvious ones are AMR-NB, AMR-WB,
> G.722.1, G.722.2 (which is basically AMR-WB by another name), G.723.1,
> G.728, G.729, G.729.1. If you look through the ETSI and ITU web sites
> you can find some material about who claims patents related to these
> codecs. However, the information is far from complete. In most cases the
> actual patent numbers claimed to be relevant are not listed. The dates
> of filing, granting and expiration are not generally listed, though if
> the patent numbers are available the dates are easy to find.
>
> I think it would be valuable to start a web page where all this
> information is gathered. We might then get a real picture of when a
> codec will become unencumbered.
>
> Clearly, video and even image, codecs are also of relevance to us.
> However, I think the speech codecs would be a good starting point.
>
> Steve
>
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-- 
wasim h. baig | principal consultant | convergence pk | +92 300 8508070
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