Assume 16 kbps for a conversation
 | Lots for overhead
| Assumes half duplex (only one part speaking at a time)
| Assumes no pauses in conversation
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| Assume 16 kbps for a conversation
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| 16 kbps * 60 sec/min = 960 kb/min |
| 960 kb/min ? 8 bits/byte = 120 kbytes/min |
| 120 kbytes/min = .12 Mbytes/min |
| .12 Mbytes/min * 5 cents/Mbyte = .6 cents/minute |
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