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...oo 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: &g...

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? -------------- next part -------------- An HTML attachment was scrubbed... URL:

...ut. > > If someone has any further advice in this direction, I would deeply > appreciate it. > > Quoting "Fabio Pietrosanti (naif)" <lists at infosecurity.ch>: > > > 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) . > > > Does this have something to do with side-channel attacks? > > Anyway... I'll just use speex with CBR. Thanks f...

...I'll let you know how it works out. If someone has any further advice in this direction, I would deeply appreciate it. Quoting "Fabio Pietrosanti (naif)" <lists at infosecurity.ch>: > > > 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) . > Does this have something to do with side-channel attacks? Anyway... I'll just use speex with CBR. Thanks for the tip. ~ J -------------- nex...

Hi, is someone working on a way to do encrypted GSM-Call with asterisk? There's a client for some cellphones (symbian, privategsm), but i could not find anything that has an asterisk-side implementation... Regards Jay -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20091210/3afc6b00/attachment.htm

...or should I persevere with making this work? thanks James ---snip--- Patch SRTP for 32bit SRTP have a cryptographic hash to check the integrity of the encrypted packets. It support two hash size: ? 32bit ? 80bit In order to properly fine tune SRTP for mobile networks and to have compatibility with PrivateGSM Enterprise we must use SRTP with hash at 32bit (HMAC_SHA1_32). Asterisk 1.8 by default does not announce in SDP both 32bit and 80bit, but only the 80bit version even if both are supported. This very small 1 line patch make Asterisk by default work with SRTP hash at 32bit . Download the patch for HM...