This is exactly what I did.That is odd.. Especially since you got higher bandwidth usage with GSM than you did with G.711..
I used Xten's GSM driver to call a Zap extension. Readings where 100 Kbits/s. Using uLAW returned 80 Kbits/s !!!
I also downloaded Xten pro to test their g729 codec, readings were even worse.
That's why I'm so intrigued.
This is a good site to give you an indication of the bandwidth requirements for various codecs under various conditions..
http://www.packetizer.com/iptel/bandcalc.html
Later..
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