Using Ekiga v.3.9.90 ... You can see it here: http://pix.toile-libre.org/?img=1367698438.png

My observation:

When you (or Ekiga, or the sound card) took samples at 8 kHz and transmit two-sample running average(*) off the stream, you'll get 0.7 dB down at 1 kHz
3.0 dB down at 2 kHz
8.3 dB down at 3 kHz
12.6 dB down at 3.4kHz

Fairly close to 1367698438.png but not exact.

(*) a+b, b+c, c+d, ... where samples are a,b,c,d,...

Another possibility is down-sampling from 44.1kHz sound card but I have no idea 
how it works.

--fred k
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