Other AMR AMR-WB Parameters
AMR/AMR-WB support the following additional optional parameters. These parameters are irrelevant in the transcoding decision process. However, they can change the SDP in the answer returned to the session initiator.
channels mode-change-neighbor
crc mode-change-period
interleaving mode-set
max-red octet-align
maxtime ptime
mode-change-capability robust-sorting