title: Is G729 codec 32kbps or 8 kbps?
body: <p>I'm building a VOIP app for iphone and android. I'm currently using the GSM codec ( I chose it arbitrarily) on both versions of my app and on my asterisk server.</p>
  
  <p>Now that I'm fine tuning my app, I'd like to try different audio codecs.  I'm considering G729.  I did a research and wasn't sure why some sites say the G729 codec uses about 32kbps as in this site here</p>
  
  <p><a href="http://voip.about.com/od/voipbandwidth/f/How-Much-Of-My-Mobile-Data-Plan-Does-Voip-Consume.htm" rel="nofollow">http://voip.about.com/od/voipbandwidth/f/How-Much-Of-My-Mobile-Data-Plan-Does-Voip-Consume.htm</a></p>
  
  <p>while others say it is 8kpbs like this site here</p>
  
  <p><a href="http://www.javvin.com/protocolG7xx.html" rel="nofollow">http://www.javvin.com/protocolG7xx.html</a></p>
  
  <p>I did some tests and it seems that 1 minute of conversation with the G729 codec uses up 0.5 mb of data.  So it seems like the first link is correct.  But i've seen other sites list similar stats of 8kbps...why the discrepancy?</p>