Speex dev - Dec 2008 - Speex on Nokia Symbian S60 phones

Is speex at this stage a good codec to use for real-time voice transmission
over a direct CSD connection between two phones?  Does anyone have any
experience with using Speex on Nokia phones?

If speex is not a good solution for this task, what would you recommend?
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Speex it's too cpu expensive for general S60 usage, it would require a 
lot of ASM optimization.

If you are using CSD, like for a secure telephony solution 
(http://m.privategsm.com), consider that speex is VBR and VBR codecs are 
not recommended for security reasons 
(http://zfoneproject.com/faq.html#vbr) .

Regards,
Fabio Pietrosanti

Jordan Dimov wrote:
> Is speex at this stage a good codec to use for real-time voice 
> transmission over a direct CSD connection between two phones?  Does 
> anyone have any experience with using Speex on Nokia phones? 
>
> If speex is not a good solution for this task, what would you recommend? 
> ------------------------------------------------------------------------
>
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> http://lists.xiph.org/mailman/listinfo/speex-dev
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Quoting "Fabio Pietrosanti (naif)" <lists at
infosecurity.ch>:
> Speex it's too cpu expensive for general S60 usage, it would require a
> lot of ASM optimization.
Did a quick search and saw ARM CPUs with speeds above 100 MHz. That should
actually be enough for Speex, at least for narrowband.
> If you are using CSD, like for a secure telephony solution
> (http://m.privategsm.com), consider that speex is VBR and VBR codecs are
> not recommended for security reasons
> (http://zfoneproject.com/faq.html#vbr) .
Except that Speex *defaults* to CBR and only uses VBR when told to do so.

   Jean-Marc
> Regards,
> Fabio Pietrosanti
>
> Jordan Dimov wrote:
> > Is speex at this stage a good codec to use for real-time voice
> > transmission over a direct CSD connection between two phones?  Does
> > anyone have any experience with using Speex on Nokia phones?
> >
> > If speex is not a good solution for this task, what would you
recommend?
> >
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