[VOIPSEC] [CAnet - news] Assessing Skype's network impact

[AVM]

On 12/19/05, Thomas Skora <voip at skora.net> wrote:
>
> "Christopher A. Martin" <chris at InfraVAST.com> writes:
>
> >>The G.729 codec in fact uses only 6.4 - 11.8kbps bandwidth per call, and
> >>is a much better demonstration to customers of VoIP potential (there's
> >>nothing like a dropped call/low audio quality to send a customer
> >>running, screaming out the door!) I have found that codecs like G.711
> >>(which is 64kbps) can only manage about 2 concurrent calls before audio
> >>quality takes a severe nose dive.
> >>
> >>
> >>
> > One other point to note is that the overhead includes encryption with
> > skype, as well as firewall traversal.
>
> Both task have never take place in the media stream. Look at SRTP, how
> many overhead the encryption causes here.
>
> Thomas


Hello,
As Thomas pointed out, encryption would take place in the system before it
leaves the system. As far as the symmetric encryption is not going to any
overhead in the bandwidth except padding at the last block and few bytes of
header information.

AVM