I'm not sure I understand the question or intention. Regarding bandwidth calculation, it depends upon the compression method you adopt for voice traffic. For example, G.729 encodes at 10-, 20- or 30-millisecond intervals. For details on the calculations, see JKROON (Ultimate Linux Solutions) as he dives into the details of Real-Time Transport Protocol/Session Initiation Protocol (RTP/SIP). You may also want to read Gary Audin's in-depth article on calculating VoIP bandwidth consumption.
Another point you may want to consider is that VoIP is often only configured at 10% of a link's bandwidth. For more discussion on this, I suggest you read John Bartlett's post, "Do I Want Quality of Service (QoS) or Class of Service (CoS)?" When you're done reading that, don't miss John's other article, "Do I Want Quality of Service or Quality of Experience?" Packetizer also provides an online VoIP bandwidth calculator.
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