In order to size bandwitdth requirements in your infrastructure, Keep in mind that total bandwidth is the sum of 2 symmetrical channels.
Eg: 100 concurrent calls with AMR4.75 and AMR12.2 add up to 4.78 Mbit/sec, so you will need 2.39 Mbit/sec for downlink and 2.39 Mbit/sec for uplink
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