It is a software feature also. The operator must buy the software so the AMr will be implemented in the network. It is installed in the BSC. It is also part of creation of Ater. You have to choose amr in the creation of Ater.
AMR is a new codec which allows you two mains benefits: increase radio TSL capacity and quality.
You have to define new AMR route in BSC and also MSC in order to support this new codec.
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