Adaptive Multi-Rate audio codec
Usage

Mode
Bitrate (kbit/s)
Channel
Compatible with
AMR_12.20
12.20
FR
ETSI GSM enhanced full rate
AMR_10.20
10.20
FR
-
AMR_7.95
7.95
FR/HR
-
AMR_7.40
7.40
FR/HR
TIA/EIA IS-641 TDMA enhanced full rate
AMR_6.70
6.70
FR/HR
ARIB 6.7 kbit/s enhanced full rate
AMR_5.90
5.90
FR/HR
-
AMR_5.15
5.15
FR/HR
-
AMR_4.75
4.75
FR/HR
-
AMR_SID
1.80
FR/HR
-

Question: What bitrates do the AMR codecs use?
Answer: The AMR codec uses eight codecs with bit-rates of 12.2, 10.2, 7.95, 7.40, 6.70, 5.90, 5.15 and 4.75 kbit/s.