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I'll be going to a country side for a few days and the speeds there are pathetic!

Which voice messenger uses the least amount of bandwidth in order to make voice calls to other pc's.

Speeds are a little better than dial-up nearly 80-100 kbps

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up vote 4 down vote accepted

Skype should work fine

How much bandwidth does Skype use while I'm in a call?

Skype automatically selects the best codec depending on the connection between yourself and the person you are calling. On average, Skype uses between 3-16 kilobytes/sec depending on bandwidth available for other party, network conditions in between, callers CPU performance, etc.

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Just as a reference for other people who get confused with bits and bytes when they're being transferred rather than stored... mediaroad.com/products/speedcheck/free_tools/unit_convert/… – Ivo Flipse Apr 22 '10 at 20:09
    
Just used it last week on a poor connection and it was fine. Latency will be the big challenge. – Dave M Apr 22 '10 at 20:24
    
I tried using skype there before but it refuses to connect there, though browsing through websites seemed to be relatively good. – rzlines Apr 23 '10 at 4:38

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