I have some complaints about IPKall for its poor audio quality. It is almost like they are overallocated or the company doesn't have the bandwidth capacity to handle all these calls, because you get all the artifacts and dropped words you normally experience when you are exceeding your download or upload capacity.
The free US number Freedigits.com gives you works much better without those problems. And VoiceStick (another freeby company) also seems to work without any audio problems.
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