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1.6 Mbps speed is more than enough for VoIP as it can also work well with 512 kb.
Do you face this problem during peak hours or off-peak hours too? If your connection is slow during peak hours and you go for video chatting, this problem may occur.
If you download any file during your chatting, it is possible that your download speed gets saturated resulting in patchy voice transmission over VoIP.
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