[linux-elitists] Re: Looking back ten years: Another Cypherpunksfailure (fwd)
Matt Crawford
crawdad at fnal.gov
Mon Jan 28 17:30:22 EST 2002
> There are other problems with using IPsec for VoIP.. In many cases
> you are sending a large number of rather small packets of data. In
> this case, the extra overhead of ESP can potentially double the size
> of your data.
HOW small? You'd already be adding IP+UDP+RTP headers (20 [or 40] +
8 + 12 = 40 [or 60] bytes). Using ESP with authentication would add
another 22, plus possible explicit IV and padding, if needed -- call
it 30?
20ms of uncompressed telephone quality data is 160 bytes ...
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