Please note: The support for AMR codec is stopped. If you have a business case that requires AMR support please do assess it with your Snom sales contact first (hint: Snom sales contact overview).
AMR-NB and AMR-WB require a license to unlock the codec on the phone. Please contact your Snom salesperson
and reference the part number below. AMR-NB (AMR) license - part# 3899 AMR-WB/G722.2 license - part# 3898