[cisco-voip] Incoming and outgoing traffic of VoIP calls not equal

[Aing Roda]

Hi all,
   
  I have one doubt about incoming and outgoing traffic of VoIP calls. I have a 3Mb link to internet. The link is to handle all VoIP traffic. Normally, in one call, the outgoing banwidth and the incoming banwidth should be the same. However, my 3Mb link most often handles the incoming traffic 30% less than the outgoing (30Mb up and 2Mb down). Can anyone give me an idea on this? Is it caused by the codec conversion?
   
  Thank you in advance.
   
  Roda

 
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