[wellylug] VOIP calling band-width usage
Cliff Pratt
enkidu at cliffp.com
Fri Aug 17 19:57:48 NZST 2007
Richard Wade wrote:
> On Fri, August 17, 2007 15:41, Richard Wade wrote:
>
>> The numbers I'm using are roughly 50kb/s for the VoIP, considering that
>> Skype uses G.729 and that it's a nice round number. For video, I think I
>> measured by gateway doing about 120-150kb/s (from vague memory), so
>> roughly three times the VoIP-only bandwidth. I'm considering that the
>> bandwidth usage is counted in both the upstream and downstream directions.
>
> Replying to my own message here, but noticed that I've made the assumption
> of G.729 codec (hence around 50kb/s-ish in each direction). This is
> certainly the codec I've seen used for Skype to PSTN calls. I believe
> Skype uses a proprietary licensed codec for Skype to Skype calls, which
> probably uses much less bandwidth. I've not taken these measurements, but
> I'm sure a quick Web search will reveal further information. The upshot of
> this is that if you're talking Skype to Skype (as opposed to using
> SkypeOut to call the PSTN), then you'll get many more call minutes to your
> GB of cap usage.
>
How do people find Skype? I've heard of it hosing Linux systems. There
doesn't seem to be a package in Ubuntu, not that that is a big problem.
Cheers,
Cliff
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