1、VoLTE should support AMRs with different codecs bit rate
AMR-NB (4.75 - 12.2k)
AMR-WB (6.6 - 23.85k)
AMR-NB12.2k and AMR-WB23.85k are usually adopted in drive test scenarios
2、Voice packet size in MAC Layer(TB size)
3、协议中有描述AMR的具体编码速率：
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