I profiled the energy usage on my mobile using sip connection with wifi and 3G. This is what I found:
Idle power level: 1.15 W
Active usage: 1.68 W
Idle power level: 1.35 W
Active usage: 1.93 W
It seems that the VOIP uses about 15-20% more power under 3G. Do others see such high energy consumptions using Voip as well?
PS:The codec used for the communication was G729.