Voip on Atrix 2

Guys I have Atrix 2. I need to make voip calls over wifi to a iphone 3GS.
I have tried various apps:-
1. Viber- It works fine but call quality is not that good. It's fluctuates every now and then.
2. Skype- I fail to understand skype's crappy performance on android devices. Playstore is filled with angry comments. Whenever I make a skype call, I hear a small clicking side whenever other person speaks.
3. Rebtel- same problem(clicking sound)
4.Google talk- same problem(clicking sound) with lot of background noice

Earlier on I was using a third gen ipod touch. Call clarity of skype on it was exceptional.

Note- We both are on wifi with very low pings.

I don't face any problem when I make normal GSM calls. Voice clarity on both sides is really good
 
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