Skype bandwidth consumption

[ru] Скайп потребляет 24 MB за час разговора. Входящий и исходящий трафик распределяются поровну: 28 kbps + 28 kbps = 56 kbps.
При разговоре через SOCKS прокси via SSH потребление вырастает до 60 MB за час. Исходящего при этом в 2 раза больше входящего.

Skype logoA number of visitors to Stereo blog have been found to be looking for info on how much traffic Skype consumes. So I thought I’d publish my personal observations here.

Skype-to-Skype conversation costs me 24 MB / hour incoming+outgoing in sum, with in&out roughly equal.
This amounts to 56 kbps both ways (28 kbps in + 28 kbps out). The vocoder used (voice codec) is usually ISAC, I guess.

When I was using a trick for free Skype-to-phone calls (SkypeOut) I had to employ SOCKS proxy via SSH channel and bandwidth consumption raised up to around 60 MB per hour (1 MB equaling 1 minute of talk) with outgoing traffic about twice as high as incoming.
In/Out traffic disparity in this case is likely due to the nature of SSH technology.
Codec used for SkypeOut: G.729

Note however, these figures are applicable to a “passive node” Skype instance only. If you happen to have your Skype open to the world (if you’ve got loose firewall policies or no firewall at all e.g.) to relay traffic for all the strangers out there, expect the traffic to be like you’re having a few independent Skype conversations simultaneously all the time your computer is on, regardless whether you talk or not.

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