Voice in its inherent nature is variable. It is natural to use the VBR class for voice, and transmit voice in its bursty form. On an average, human voice has an speech activity factor of about 42%. This allows us to multiplex a lot of voice sources together. We study the degradation in voice quality under various scheduling policies for VBR voice. Our simulations showed that it is desirable to keep the total VBR-voice load to about 50% of the total link capacity, in order to maintain good quality voice. The remaining link capacity could then be filled up by data.

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